ICQ nefunguje, proč?

[OndraP.]

eště jednou píšu u icq mě nejedou žádné reklamy ani žádný icq flash mám to atlasovský icq, jeli mě v pohodě, ale prostě z níčeho nic to přestalo jet... něvíte čím by to mohlo bejt?? díky

mod. by Ltb - přesun do správné sekce a sice Komunikace na internetu - jak už píše níže Luboš

[Reklama]

[Luboš]

(Problém ohledě ICQ jsi měl dát do sekce Komunikace na internetu.)

Zkus ho buď přeinstalovat, anebo použít o něco lepší program QIP a do něho si pak dodej češtinu.

[OndraP.]

ajo tak sry su taj den teprv a přeinstalovávat sem to zkoušel několikrát a qip taky mám, ale icq je hezčí

[Luboš]

Tak pokud ti problémy přetrvávají, možná máš aktivní nějaký spyware anebo jinou havěť. Zkus zabloudit do sekce HijackThis.

[OndraP.]

to ne každej den projíždím spyware terminátorem a eště vod tune up takový to uklid 1 kliknutím.... a je to ok..

[fredik]

To neznamená že když to projíždíš ST že tam nemusíš mít žádnou potvoru, nic není 100% a za kontrolu nic nedáš.

[OndraP.]

to je pravda, a co mám teda pls dělat??

[fredik]

Podle tohoto návodu udělej a vlož log na kontrolu: HijackThis

[zao]

já mám podobný problém ale narozdíl mě nejedou zvuky vlastně sem si zpoměl a není to nastavením tady je můjvýpis HJT:
Prosím o kontrolu




Logfile of HijackThis v1.99.1
Scan saved at 15:30:47, on 24.1.2007
Platform: Windows XP SP2 (WinNT 5.01.2600)
MSIE: Internet Explorer v7.00 (7.00.5730.0011)

Running processes:
C:\WINDOWS\System32\smss.exe
C:\WINDOWS\system32\winlogon.exe
C:\WINDOWS\system32\services.exe
C:\WINDOWS\system32\lsass.exe
C:\WINDOWS\system32\svchost.exe
C:\Program Files\Windows Defender\MsMpEng.exe
C:\WINDOWS\System32\svchost.exe
C:\Program Files\Ahead\InCD\InCDsrv.exe
C:\WINDOWS\system32\spoolsv.exe
C:\WINDOWS\Explorer.EXE
C:\Program Files\Common Files\LightScribe\LSSrvc.exe
C:\Program Files\Common Files\Microsoft Shared\VS7Debug\mdm.exe
C:\Program Files\Eset\nod32krn.exe
C:\WINDOWS\system32\nvsvc32.exe
C:\WINDOWS\system32\svchost.exe
C:\Program Files\RealVNC\VNC4\WinVNC4.exe
C:\Program Files\Spyware Terminator\SpywareTerminatorShield.exe
C:\WINDOWS\system32\rundll32.exe
C:\WINDOWS\system32\winsys2.exe
C:\WINDOWS\system32\RUNDLL32.EXE
C:\Program Files\Labtec\Keyboard\V5.1\kbdap32a.exe
C:\Program Files\Pinnacle\Shared Files\Programs\USBTip\USBTip.exe
C:\Program Files\ICQLite\ICQLite.exe
C:\Program Files\Skype\Phone\Skype.exe
C:\Documents and Settings\Owner\Plocha\Other\TuneUp Utilities 2008\MemOptimizer.exe
C:\WINDOWS\system32\ctfmon.exe
C:\Program Files\MSI\Core Center\CoreCenter.exe
C:\Program Files\WinClamAVShield\sp_clam.exe
C:\Program Files\Skype\Plugin Manager\SkypePM.exe
C:\Program Files\Mozilla Firefox\firefox.exe
C:\Documents and Settings\Owner\Plocha\HijackThis.exe

R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Search Bar = http://google.icq.com/search/search_frame.php
R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Search Page = http://google.icq.com
R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://seznam.cz/
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Page_URL = http://go.microsoft.com/fwlink/?LinkId=69157
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Search_URL = http://go.microsoft.com/fwlink/?LinkId=54896
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Search Page = http://go.microsoft.com/fwlink/?LinkId=54896
R0 - HKLM\Software\Microsoft\Internet Explorer\Main,Start Page = http://go.microsoft.com/fwlink/?LinkId=69157
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName = Odkazy
O2 - BHO: AcroIEHlprObj Class - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - C:\Program Files\Adobe\Acrobat 5.0\Reader\ActiveX\AcroIEHelper.ocx
O2 - BHO: Megaupload Toolbar - {4E7BD74F-2B8D-469E-CCB0-B130EEDBE97C} - C:\PROGRA~1\MEGAUP~1\MEGAUP~1.DLL
O2 - BHO: SSVHelper Class - {761497BB-D6F0-462C-B6EB-D4DAF1D92D43} - C:\Program Files\Java\jre1.5.0_10\bin\ssv.dll
O2 - BHO: Google Toolbar Helper - {AA58ED58-01DD-4d91-8333-CF10577473F7} - c:\program files\google\googletoolbar1.dll
O3 - Toolbar: Megaupload Toolbar - {4E7BD74F-2B8D-469E-CCB0-B130EEDBE97C} - C:\PROGRA~1\MEGAUP~1\MEGAUP~1.DLL
O3 - Toolbar: &Google - {2318C2B1-4965-11d4-9B18-009027A5CD4F} - c:\program files\google\googletoolbar1.dll
O4 - HKLM\..\Run: [SpywareTerminator] "C:\Program Files\Spyware Terminator\SpywareTerminatorShield.exe"
O4 - HKLM\..\Run: [nwiz] nwiz.exe /install
O4 - HKLM\..\Run: [NvCplDaemon] RUNDLL32.EXE C:\WINDOWS\system32\NvCpl.dll,NvStartup
O4 - HKLM\..\Run: [SW20] C:\WINDOWS\system32\sw20.exe
O4 - HKLM\..\Run: [SW24] C:\WINDOWS\system32\sw24.exe
O4 - HKLM\..\Run: [WinSys2] C:\WINDOWS\system32\winsys2.exe
O4 - HKLM\..\Run: [NvMediaCenter] RUNDLL32.EXE C:\WINDOWS\system32\NvMcTray.dll,NvTaskbarInit
O4 - HKLM\..\Run: [OFFICEKB] C:\Program Files\Labtec\Keyboard\V5.1\kbdap32a.exe
O4 - HKLM\..\Run: [USBToolTip] "C:\Program Files\Pinnacle\Shared Files\\Programs\USBTip\USBTip.exe"
O4 - HKLM\..\Run: [PinnacleDriverCheck] C:\WINDOWS\system32\PSDrvCheck.exe -CheckReg
O4 - HKLM\..\Run: [ICQ Lite] "C:\Program Files\ICQLite\ICQLite.exe" -minimize
O4 - HKCU\..\Run: [Skype] "C:\Program Files\Skype\Phone\Skype.exe" /nosplash /minimized
O4 - HKCU\..\Run: [TuneUp MemOptimizer] "C:\Documents and Settings\Owner\Plocha\Other\TuneUp Utilities 2008\MemOptimizer.exe" autostart
O4 - HKCU\..\Run: [ctfmon.exe] C:\WINDOWS\system32\ctfmon.exe
O4 - Startup: Adobe Gamma.lnk = C:\Program Files\Common Files\Adobe\Calibration\Adobe Gamma Loader.exe
O4 - Global Startup: CoreCenter.lnk = C:\Program Files\MSI\Core Center\CoreCenter.exe
O4 - Global Startup: Microsoft Office.lnk = C:\Program Files\Microsoft Office\Office10\OSA.EXE
O8 - Extra context menu item: E&xportovat do aplikace Microsoft Excel - res://C:\PROGRA~1\MICROS~2\Office10\EXCEL.EXE/3000
O9 - Extra button: (no name) - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\Program Files\Java\jre1.5.0_10\bin\ssv.dll
O9 - Extra 'Tools' menuitem: Sun Java Console - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\Program Files\Java\jre1.5.0_10\bin\ssv.dll
O9 - Extra button: ICQ Lite - {B863453A-26C3-4e1f-A54D-A2CD196348E9} - C:\Program Files\ICQLite\ICQLite.exe
O9 - Extra 'Tools' menuitem: ICQ Lite - {B863453A-26C3-4e1f-A54D-A2CD196348E9} - C:\Program Files\ICQLite\ICQLite.exe
O9 - Extra button: (no name) - {e2e2dd38-d088-4134-82b7-f2ba38496583} - %windir%\Network Diagnostic\xpnetdiag.exe (file missing)
O9 - Extra 'Tools' menuitem: @xpsp3res.dll,-20001 - {e2e2dd38-d088-4134-82b7-f2ba38496583} - %windir%\Network Diagnostic\xpnetdiag.exe (file missing)
O9 - Extra button: Messenger - {FB5F1910-F110-11d2-BB9E-00C04F795683} - C:\Program Files\Messenger\msmsgs.exe
O9 - Extra 'Tools' menuitem: Windows Messenger - {FB5F1910-F110-11d2-BB9E-00C04F795683} - C:\Program Files\Messenger\msmsgs.exe
O11 - Options group: [INTERNATIONAL] International*
O12 - Plugin for .spop: C:\Program Files\Internet Explorer\Plugins\NPDocBox.dll
O18 - Protocol: skype4com - {FFC8B962-9B40-4DFF-9458-1830C7DD7F5D} - C:\PROGRA~1\COMMON~1\Skype\SKYPE4~1.DLL
O20 - Winlogon Notify: WgaLogon - C:\WINDOWS\SYSTEM32\WgaLogon.dll
O21 - SSODL: WPDShServiceObj - {AAA288BA-9A4C-45B0-95D7-94D524869DB5} - C:\WINDOWS\system32\WPDShServiceObj.dll
O23 - Service: Adobe LM Service - Adobe Systems - C:\Program Files\Common Files\Adobe Systems Shared\Service\Adobelmsvc.exe
O23 - Service: InCD Helper (InCDsrv) - Nero AG - C:\Program Files\Ahead\InCD\InCDsrv.exe
O23 - Service: LightScribeService Direct Disc Labeling Service (LightScribeService) - Hewlett-Packard Company - C:\Program Files\Common Files\LightScribe\LSSrvc.exe
O23 - Service: NOD32 Kernel Service (NOD32krn) - Eset - C:\Program Files\Eset\nod32krn.exe
O23 - Service: NVIDIA Display Driver Service (NVSvc) - NVIDIA Corporation - C:\WINDOWS\system32\nvsvc32.exe
O23 - Service: SF FrontLine Drivers Auto Removal (v1) (sfrem01) - Protection Technology (StarForce) - C:\WINDOWS\system32\sfrem01.exe
O23 - Service: VNC Server Version 4 (WinVNC4) - Unknown owner - C:\Program Files\RealVNC\VNC4\WinVNC4.exe" -service (file missing)

[OndraP.]

tak tady to je:

Logfile of HijackThis v1.99.1
Scan saved at 15:25:45, on 24.1.2007
Platform: Windows XP SP2 (WinNT 5.01.2600)
MSIE: Internet Explorer v6.00 SP2 (6.00.2900.2180)

Running processes:
C:\WINDOWS\System32\smss.exe
C:\WINDOWS\system32\winlogon.exe
C:\WINDOWS\system32\services.exe
C:\WINDOWS\system32\lsass.exe
C:\WINDOWS\system32\svchost.exe
C:\WINDOWS\System32\svchost.exe
C:\WINDOWS\system32\spoolsv.exe
C:\WINDOWS\Explorer.EXE
C:\WINDOWS\SOUNDMAN.EXE
C:\Program Files\Eset\nod32kui.exe
C:\Program Files\Spyware Terminator\SpywareTerminatorShield.exe
C:\Program Files\MSI\Live Update 3\LMonitor.exe
C:\Program Files\Labtec\Keyboard\V5.1\kbdap32a.exe
C:\Program Files\Unlocker\UnlockerAssistant.exe
C:\Program Files\CyberLink\PowerDVD\PDVDServ.exe
C:\WINDOWS\system32\winsys2.exe
C:\WINDOWS\system32\RUNDLL32.EXE
C:\Program Files\Pinnacle\Shared Files\Programs\USBTip\USBTip.exe
C:\Program Files\ICQLite\ICQLite.exe
C:\Program Files\Java\jre1.6.0\bin\jusched.exe
C:\WINDOWS\system32\ctfmon.exe
C:\Program Files\Common Files\Microsoft Shared\VS7DEBUG\MDM.EXE
C:\Program Files\Eset\nod32krn.exe
C:\WINDOWS\system32\nvsvc32.exe
C:\Program Files\CyberLink\Shared files\RichVideo.exe
C:\Program Files\WinClamAVShield\sp_clam.exe
C:\Program Files\Skype\Phone\Skype.exe
C:\Program Files\Common Files\Ahead\lib\NMBgMonitor.exe
D:\TuneUp Utilities 2007\MemOptimizer.exe
C:\Program Files\CursorXP\CursorXP.exe
C:\WINDOWS\system32\svchost.exe
C:\WINDOWS\system32\mqsvc.exe
C:\WINDOWS\system32\mqtgsvc.exe
C:\Program Files\Skype\Plugin Manager\SkypePM.exe
C:\WINDOWS\system32\wuauclt.exe
C:\Program Files\Mozilla Firefox\firefox.exe
C:\Program Files\Azureus\Azureus.exe
C:\WINDOWS\system32\igfxsrvc.exe
C:\WINDOWS\system32\calc.exe
C:\Documents and Settings\Volby6\Plocha\Hijackthis\HijackThis.exe

R1 - HKCU\Software\Microsoft\Internet Explorer\Main,SearchAssistant = http://search.bearshare.com/sidebar.html?src=ssb
R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Search Bar = http://google.icq.com/search/search_frame.php
R1 - HKCU\Software\Microsoft\Internet Explorer\Main,Search Page = http://google.icq.com
R0 - HKCU\Software\Microsoft\Internet Explorer\Main,Start Page = http://www.atlas.cz/?from=icqhp
R0 - HKLM\Software\Microsoft\Internet Explorer\Search,SearchAssistant =
R1 - HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings,ProxyServer = 127.0.0.1:8080
R1 - HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings,ProxyOverride = local
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName = Odkazy
R3 - URLSearchHook: BearShare MediaBar - {D3DEE18F-DB64-4BEB-9FF1-E1F0A5033E4A} - (no file)
O2 - BHO: XTTBPos00 - {055FD26D-3A88-4e15-963D-DC8493744B1D} - C:\Program Files\ICQToolbar\toolbaru.dll
O2 - BHO: Megaupload Toolbar - {4E7BD74F-2B8D-469E-CCB0-B130EEDBE97C} - C:\PROGRA~1\MEGAUP~1\MEGAUP~1.DLL
O2 - BHO: SSVHelper Class - {761497BB-D6F0-462C-B6EB-D4DAF1D92D43} - C:\Program Files\Java\jre1.6.0\bin\ssv.dll
O3 - Toolbar: BearShare MediaBar - {D3DEE18F-DB64-4BEB-9FF1-E1F0A5033E4A} - (no file)
O3 - Toolbar: Megaupload Toolbar - {4E7BD74F-2B8D-469E-CCB0-B130EEDBE97C} - C:\PROGRA~1\MEGAUP~1\MEGAUP~1.DLL
O3 - Toolbar: ICQ Toolbar - {855F3B16-6D32-4fe6-8A56-BBB695989046} - C:\Program Files\ICQToolbar\toolbaru.dll
O4 - HKLM\..\Run: [SoundMan] SOUNDMAN.EXE
O4 - HKLM\..\Run: [nod32kui] "C:\Program Files\Eset\nod32kui.exe" /WAITSERVICE
O4 - HKLM\..\Run: [igfxtray] C:\WINDOWS\system32\igfxtray.exe
O4 - HKLM\..\Run: [igfxhkcmd] C:\WINDOWS\system32\hkcmd.exe
O4 - HKLM\..\Run: [igfxpers] C:\WINDOWS\system32\igfxpers.exe
O4 - HKLM\..\Run: [SpywareTerminator] "C:\Program Files\Spyware Terminator\SpywareTerminatorShield.exe"
O4 - HKLM\..\Run: [NvCplDaemon] RUNDLL32.EXE C:\WINDOWS\system32\NvCpl.dll,NvStartup
O4 - HKLM\..\Run: [nwiz] nwiz.exe /install
O4 - HKLM\..\Run: [SW20] C:\WINDOWS\system32\sw20.exe
O4 - HKLM\..\Run: [SW24] C:\WINDOWS\system32\sw24.exe
O4 - HKLM\..\Run: [LiveMonitor] C:\Program Files\MSI\Live Update 3\LMonitor.exe
O4 - HKLM\..\Run: [OFFICEKB] C:\Program Files\Labtec\Keyboard\V5.1\kbdap32a.exe
O4 - HKLM\..\Run: [UnlockerAssistant] "C:\Program Files\Unlocker\UnlockerAssistant.exe"
O4 - HKLM\..\Run: [RemoteControl] "C:\Program Files\CyberLink\PowerDVD\PDVDServ.exe"
O4 - HKLM\..\Run: [LanguageShortcut] "C:\Program Files\CyberLink\PowerDVD\Language\Language.exe"
O4 - HKLM\..\Run: [WinSys2] C:\WINDOWS\system32\winsys2.exe
O4 - HKLM\..\Run: [NvMediaCenter] RUNDLL32.EXE C:\WINDOWS\system32\NvMcTray.dll,NvTaskbarInit
O4 - HKLM\..\Run: [NeroFilterCheck] C:\WINDOWS\system32\NeroCheck.exe
O4 - HKLM\..\Run: [USBToolTip] "C:\Program Files\Pinnacle\Shared Files\Programs\USBTip\USBTip.exe"
O4 - HKLM\..\Run: [PinnacleDriverCheck] C:\WINDOWS\system32\PSDrvCheck.exe -CheckReg
O4 - HKLM\..\Run: [ICQ Lite] "C:\Program Files\ICQLite\ICQLite.exe" -minimize
O4 - HKLM\..\Run: [SunJavaUpdateSched] "C:\Program Files\Java\jre1.6.0\bin\jusched.exe"
O4 - HKCU\..\Run: [CTFMON.EXE] C:\WINDOWS\system32\ctfmon.exe
O4 - HKCU\..\Run: [Skype] "C:\Program Files\Skype\Phone\Skype.exe" /nosplash /minimized
O4 - HKCU\..\Run: [BgMonitor_{79662E04-7C6C-4d9f-84C7-88D8A56B10AA}] "C:\Program Files\Common Files\Ahead\lib\NMBgMonitor.exe"
O4 - HKCU\..\Run: [TuneUp MemOptimizer] "D:\TuneUp Utilities 2007\MemOptimizer.exe" autostart
O4 - HKCU\..\Run: [CursorXP] C:\Program Files\CursorXP\CursorXP.exe
O4 - HKCU\..\RunOnce: [ICQ Lite] C:\Program Files\ICQLite\ICQLite.exe -trayboot
O4 - Startup: Adobe Gamma.lnk = C:\Program Files\Common Files\Adobe\Calibration\Adobe Gamma Loader.exe
O8 - Extra context menu item: E&xportovat do aplikace Microsoft Office Excel - res://C:\PROGRA~1\MICROS~2\OFFICE11\EXCEL.EXE/3000
O9 - Extra button: (no name) - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\Program Files\Java\jre1.6.0\bin\npjpi160.dll
O9 - Extra 'Tools' menuitem: Sun Java Console - {08B0E5C0-4FCB-11CF-AAA5-00401C608501} - C:\Program Files\Java\jre1.6.0\bin\npjpi160.dll
O9 - Extra button: Zdroje informací - {92780B25-18CC-41C8-B9BE-3C9C571A8263} - C:\PROGRA~1\MICROS~2\OFFICE11\REFIEBAR.DLL
O9 - Extra button: ICQ Lite - {B863453A-26C3-4e1f-A54D-A2CD196348E9} - C:\Program Files\ICQLite\ICQLite.exe
O9 - Extra 'Tools' menuitem: ICQ Lite - {B863453A-26C3-4e1f-A54D-A2CD196348E9} - C:\Program Files\ICQLite\ICQLite.exe
O9 - Extra button: Messenger - {FB5F1910-F110-11d2-BB9E-00C04F795683} - C:\Program Files\Messenger\msmsgs.exe
O9 - Extra 'Tools' menuitem: Windows Messenger - {FB5F1910-F110-11d2-BB9E-00C04F795683} - C:\Program Files\Messenger\msmsgs.exe
O18 - Protocol: skype4com - {FFC8B962-9B40-4DFF-9458-1830C7DD7F5D} - C:\PROGRA~1\COMMON~1\Skype\SKYPE4~1.DLL
O20 - Winlogon Notify: igfxcui - C:\WINDOWS\SYSTEM32\igfxdev.dll
O20 - Winlogon Notify: WgaLogon - C:\WINDOWS\SYSTEM32\WgaLogon.dll
O23 - Service: Adobe LM Service - Adobe Systems - C:\Program Files\Common Files\Adobe Systems Shared\Service\Adobelmsvc.exe
O23 - Service: NOD32 Kernel Service (NOD32krn) - Eset - C:\Program Files\Eset\nod32krn.exe
O23 - Service: NVIDIA Display Driver Service (NVSvc) - NVIDIA Corporation - C:\WINDOWS\system32\nvsvc32.exe
O23 - Service: Cyberlink RichVideo Service(CRVS) (RichVideo) - Unknown owner - C:\Program Files\CyberLink\Shared files\RichVideo.exe
O23 - Service: SF FrontLine Drivers Auto Removal (v1) (sfrem01) - Protection Technology (StarForce) - C:\WINDOWS\system32\sfrem01.exe
O23 - Service: VNC Server Version 4 (WinVNC4) - Unknown owner - C:\Program Files\RealVNC\VNC4\WinVNC4.exe" -service (file missing)

[fredik]

Toto platí pro oba:

Toto otestuj na VirusTotall
C:\WINDOWS\system32\winsys2.exe a dej sem výsledek.

Toto pro: OndraP.
Ukonči v TaskManageru (zmáčkni zároveň klávesy ctrl+alt+delete) otevře se ti okno a v něm se přepni na záložku Procesy a v ní ukonči:
jusched.exe

Spusť znovu HijackThis a zaškrtni v něm okénka před řádky:
R1 - HKCU\Software\Microsoft\Internet Explorer\Main,SearchAssistant = http://search.bearshare.com/sidebar.html?src=ssb
R0 - HKLM\Software\Microsoft\Internet Explorer\Search,SearchAssistant =
R3 - URLSearchHook: BearShare MediaBar - {D3DEE18F-DB64-4BEB-9FF1-E1F0A5033E4A} - (no file)
O3 - Toolbar: BearShare MediaBar - {D3DEE18F-DB64-4BEB-9FF1-E1F0A5033E4A} - (no file)
O4 - HKLM\..\Run: [NeroFilterCheck] C:\WINDOWS\system32\NeroCheck.exe
O4 - HKLM\..\Run: [SunJavaUpdateSched] "C:\Program Files\Java\jre1.6.0\bin\jusched.exe"
po zaškrtnutí klikni na tlačítko Fix Checked

to VNC sis tam dal sám?

Pro: zao
fixni v HJT toto:
O9 - Extra button: (no name) - {e2e2dd38-d088-4134-82b7-f2ba38496583} - %windir%\Network Diagnostic\xpnetdiag.exe (file missing)
O9 - Extra 'Tools' menuitem: @xpsp3res.dll,-20001 - {e2e2dd38-d088-4134-82b7-f2ba38496583} - %windir%\Network Diagnostic\xpnetdiag.exe (file missing)


to VNC sis tam dal sám?

[OndraP.]

n nikam sem VNC nedával, jen nainstaloval nic víc