Real Big Problem with Trojan Horse Back Door Generic3. EDC :( Can any one pls help me? Thank you for

Recently I have a big prolem with my laptop---itz infected by trojan horse back door generic3.EDC . I've tried many anti spyware software and anti virus programs...Everytime when my laptop is healed from the spyware and virus, few hours later it'll come out again...wondering whatz the problem...i'm not familiar with spyware and virus, I hope that I can seek for assistance here...I really need yr help...thank you very much.

The followings are the result of scanning Hijack This : Logfile of HijackThis v1.99.1

Scan saved at 9:10:54 AM, on 10/8/2006

Platform: Windows XP SP1 (WinNT 5.01.2600)

MSIE: Internet Explorer v6.00 SP1 (6.00.2800.1106)

Running processes:

C:\WINDOWS\System32\smss.exe

C:\WINDOWS\system32\csrss.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\svchost.exe

C:\WINDOWS\System32\svchost.exe

C:\WINDOWS\system32\spoolsv.exe

Real Big Problem with Trojan Horse Back Door Generic3. EDC :( Can any one pls help me? Thank you for yr replyinternet security 2006

A newer version of service pack is available. Service packs increase the safety of your system. Visit Microsoft's windowsupdate site to download the newest version of the service pack.