How do i get rid of a virus that says i need to run a full system scan?

Logfile of Trend Micro HijackThis v2.0.2

Scan saved at 1:04:35 AM, on 4/26/2008

Platform: Windows XP SP2 (WinNT 5.01.2600)

MSIE: Internet Explorer v6.00 SP2 (6.00.2900.2180)

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:\WINDOWS\System32\svchost.exe

C:\WINDOWS\system32\Ati2evxx.exe

C:\Program Files\Common Files\Symantec Shared\ccSvcHst.exe

C:\WINDOWS\Explorer.EXE

C:\Program Files\Common Files\Symantec Shared\AppCore\AppSvc32.exe

C:\WINDOWS\system32\spoolsv.exe

C:\Program Files\Symantec\LiveUpdate\ALUSchedulerSv...

c:\Program Files\Common Files\LightScribe\LSSrvc.exe

C:\Program Files\Common Files\Microsoft Shared\VS7DEBUG\MDM.EXE

C:\WINDOWS\winself.exe

C:\WINDOWS\system32\HPZipm12.exe

C:\WINDOWS\system32\svchost.exe

C:\WINDOWS\system32\MsPMSPSv.exe

C:\Program Files\Linksys Wireless-G PCI Wireless Network Monitor\WLService.exe

C:\Program Files\Linksys Wireless-G PCI Wireless Network Monitor\WMP54Gv4.exe

C:\Program Files\Common Files\Symantec Shared\ccApp.exe

C:\WINDOWS\ALCXMNTR.EXE

C:\WINDOWS\system32\ctfmon.exe

C:\Program Files\Linksys EasyLink Advisor\LinksysAgent.exe