I have been getting crc errors when trying to install games and extract zip folders. My pc has also been doing some strange things, like taskbar changing from blue to grey and the sound not working.
Here is a hijack this log
Logfile of Trend Micro HijackThis v2.0.2
Scan saved at 10:14:11 PM, on 6/24/2008
Platform: Windows XP SP3 (WinNT 5.01.2600)
MSIE: Internet Explorer v7.00 (7.00.6000.16674)
Boot mode: Normal

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\Ati2evxx.exe
C:\WINDOWS\system32\svchost.exe
C:\Program Files\Panda Security\Panda Internet Security 2008\TPSrv.exe
C:\WINDOWS\system32\Ati2evxx.exe
C:\Program Files\Panda Security\Panda Internet Security 2008\PsCtrls.exe
C:\Program Files\Panda Security\Panda Internet Security 2008\PavFnSvr.exe
C:\Program Files\Common Files\Panda Software\PavShld\pavprsrv.exe
C:\Program Files\Panda Security\Panda Internet Security 2008\pavsrv51.exe
C:\Program Files\Panda Security\Panda Internet Security 2008\AntiSpam\pskmssvc.exe
C:\Program Files\Panda Security\Panda Internet Security 2008\AVENGINE.EXE
c:\program files\panda security\panda internet security 2008\firewall\PSHOST.EXE
C:\Program Files\Panda Security\Panda Internet Security 2008\PsImSvc.exe
C:\WINDOWS\Explorer.EXE
C:\Program Files\Panda Security\Panda Internet Security 2008\ApvxdWin.exe
C:\WINDOWS\RTHDCPL.EXE
C:\Program Files\Logitech\G-series Software\LGDCore.exe
C:\Program Files\Logitech\G-series Software\LCDMon.exe
C:\Program Files\ATI Technologies\ATI.ACE\Core-Static\MOM.EXE
C:\Program Files\Messenger\msmsgs.exe
C:\Program Files\Logitech\G-series Software\Applets\LCDPop3\LCDPOP3.exe
C:\Program Files\Logitech\G-series Software\Applets\LCDMedia.exe
C:\Program Files\Logitech\G-series Software\Applets\LCDClock.exe
C:\Program Files\Spybot - Search & Destroy\TeaTimer.exe
C:\Program Files\Logitech\SetPoint\SetPoint.exe
C:\Program Files\Common Files\Logitech\khalshared\KHALMNPR.EXE
C:\Program Files\ATI Technologies\ATI.ACE\Core-Static\ccc.exe
C:\Program Files\Panda Security\Panda Internet Security 2008\SRVLOAD.EXE
C:\Program Files\Panda Security\Panda Internet Security 2008\WebProxy.exe
C:\Program Files\Panda Security\Panda Internet Security 2008\PavBckPT.exe
C:\WINDOWS\System32\svchost.exe
C:\Program Files\Internet Explorer\iexplore.exe
C:\Documents and Settings\Sarah\My Documents\New Folder\HiJackThis.exe

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
O2 - BHO: Spybot-S&D IE Protection - {53707962-6F74-2D53-2644-206D7942484F} - C:\PROGRA~1\SPYBOT~1\SDHelper.dll
O4 - HKLM\..\Run: [RTHDCPL] RTHDCPL.EXE
O4 - HKLM\..\Run: [Alcmtr] ALCMTR.EXE
O4 - HKLM\..\Run: [JMB36X IDE Setup] C:\WINDOWS\JM\JMInsIDE.exe
O4 - HKLM\..\Run: [36X Raid Configurer] C:\WINDOWS\system32\JMRaidSetup.exe boot
O4 - HKLM\..\Run: [APVXDWIN] "C:\Program Files\Panda Security\Panda Internet Security 2008\APVXDWIN.EXE" /s
O4 - HKLM\..\Run: [SCANINICIO] "C:\Program Files\Panda Security\Panda Internet Security 2008\Inicio.exe"
O4 - HKLM\..\Run: [StartCCC] "C:\Program Files\ATI Technologies\ATI.ACE\Core-Static\CLIStart.exe"
O4 - HKLM\..\Run: [Launch LGDCore] "C:\Program Files\Logitech\G-series Software\LGDCore.exe" /SHOWHIDE
O4 - HKLM\..\Run: [Launch LCDMon] "C:\Program Files\Logitech\G-series Software\LCDMon.exe"
O4 - HKLM\..\Run: [Kernel and Hardware Abstraction Layer] KHALMNPR.EXE
O4 - HKLM\..\Run: [UserFaultCheck] %systemroot%\system32\dumprep 0 -u
O4 - HKCU\..\Run: [MSMSGS] "C:\Program Files\Messenger\msmsgs.exe" /background
O4 - HKCU\..\Run: [SpybotSD TeaTimer] C:\Program Files\Spybot - Search & Destroy\TeaTimer.exe
O4 - Global Startup: Logitech SetPoint.lnk = ?
O9 - Extra button: (no name) - {DFB852A3-47F8-48C4-A200-58CAB36FD2A2} - C:\PROGRA~1\SPYBOT~1\SDHelper.dll
O9 - Extra 'Tools' menuitem: Spybot - Search & Destroy Configuration - {DFB852A3-47F8-48C4-A200-58CAB36FD2A2} - C:\PROGRA~1\SPYBOT~1\SDHelper.dll
O9 - Extra button: (no name) - {e2e2dd38-d088-4134-82b7-f2ba38496583} - C:\WINDOWS\Network Diagnostic\xpnetdiag.exe
O9 - Extra 'Tools' menuitem: @xpsp3res.dll,-20001 - {e2e2dd38-d088-4134-82b7-f2ba38496583} - C:\WINDOWS\Network Diagnostic\xpnetdiag.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
O16 - DPF: {2D8ED06D-3C30-438B-96AE-4D110FDC1FB8} (ActiveScan 2.0 Installer Class) - http://acs.pandasoftware.com/actives.../as2stubie.cab
O16 - DPF: {6E32070A-766D-4EE6-879C-DC1FA91D2FC3} (MUWebControl Class) - http://www.update.microsoft.com/micr...?1214357530765
O17 - HKLM\System\CCS\Services\Tcpip\..\{02D5B361-A00C-4340-8DC9-830C1FE6B8E8}: NameServer = 192.168.1.1
O17 - HKLM\System\CS2\Services\Tcpip\..\{02D5B361-A00C-4340-8DC9-830C1FE6B8E8}: NameServer = 192.168.1.1
O23 - Service: Ati HotKey Poller - ATI Technologies Inc. - C:\WINDOWS\system32\Ati2evxx.exe
O23 - Service: ATI Smart - Unknown owner - C:\WINDOWS\system32\ati2sgag.exe
O23 - Service: Panda Software Controller - Panda Software International - C:\Program Files\Panda Security\Panda Internet Security 2008\PsCtrls.exe
O23 - Service: Panda Function Service (PAVFNSVR) - Panda Software International - C:\Program Files\Panda Security\Panda Internet Security 2008\PavFnSvr.exe
O23 - Service: Panda Process Protection Service (PavPrSrv) - Panda Software - C:\Program Files\Common Files\Panda Software\PavShld\pavprsrv.exe
O23 - Service: Panda anti-virus service (PAVSRV) - Panda Software International - C:\Program Files\Panda Security\Panda Internet Security 2008\pavsrv51.exe
O23 - Service: Panda Antispam Engine (pmshellsrv) - Panda Software International - C:\Program Files\Panda Security\Panda Internet Security 2008\AntiSpam\pskmssvc.exe
O23 - Service: Panda Host Service (PSHost) - Panda Software International - c:\program files\panda security\panda internet security 2008\firewall\PSHOST.EXE
O23 - Service: Panda IManager Service (PSIMSVC) - Panda Software International - C:\Program Files\Panda Security\Panda Internet Security 2008\PsImSvc.exe
O23 - Service: Panda TPSrv (TPSrv) - Panda Software International - C:\Program Files\Panda Security\Panda Internet Security 2008\TPSrv.exe

--
End of file - 6670 bytes

Looks normal, though I'm not a `trained expert` in HJT logs.
Why do you assume infection? Have you run a ChkDsk, an HD diagnostic from your HD manufacturer, a memory test ? Admittedly memory problems usually result in blue screens but worth doing anyway. Ensure all your devices are using the latest drivers. Do a System File Check too.

Run ChkDsk; http://support.microsoft.com/kb/315265
Run SFC; http://www.updatexp.com/scannow-sfc.html

Manufacturers HD diagnostics;
http://home.comcast.net/~SupportCD/D...html#Harddrive
http://www.pcstats.com/articleview.c...id=1583&page=6

Info about your PC if needed for the above: www.gtopala.com
Memory test; http://www.memtest.org

Taskbar colour change - go into Control Panel/Desktop and ensure Windows XP theme is selected;http://www.helpwithpcs.com/tipsandtr...eme-win-xp.htm

If it is selected and you still have the plain-looking Classic appearance - ensure the Themes service is started and set to Automatic. Go to Start menu/run, type Services.msc, press return, scroll down the list to Themes and check the aforementioned settings.

I have run memtest 86 overnight. I have tried dropping my O/C back to standard. Whatever this is it disables my anti virus when it changes the taskbar colour. I have replaced my hdd with a new one still get the problem. I am doing a complete virus scan on panda active online atm.

Does it stop any other services when this happens? System Restore no good? Any enlightening entries in the Event log?