System.exe et Isass.exe=trojans?aide?enlever?

Bonjour,

dans http://www.processlibrary.com/ j´ai verifier mes process et il a

-Isass.exe qui dit:
Process File: isass.exe
Process Name: Optix.Pro virus

Description: isass.exe is registered as the Optix.Pro virus which carries in it´s payload, the ability to disable firewalls and local security protections, and a backdoor capability.
For More Info About isass.exe - Get WinTasks 5 Pro Now!

Author: n/a
Part of: Optix.Pro virus

System Process: No
Application: No
Background Process: No
Uses Network: No
Uses Internet: No
Hardware Related: No
Memory Usage : N/A ( Free Up Memory )

Spyware: No ( Remove )
Adware No ( Remove )
Virus: No ( Remove )
Trojan: Yes ( Remove )
Security Risk ( 0-5): 4
Block/Remove: Use WinTasks 5 Pro to Block/Remove isass.exe

-system.exe qui dit:
Process File: system.exe
Process Name: Trojan.Mitglieder.B

Description: system.exe is a process which is registered as the Net Controller 1.08 Trojan, Trojan.Mitglieder.B and Trojan.StartPage. This Trojan allows attackers to access your computer, stealing passwords and personal data. It is a registered security risk and should be removed immediately. Please see additional details regarding this process
For More Info About system.exe - Get WinTasks 5 Pro Now!

Author: na
Part of: Trojan.Mitglieder.B

System Process: No
Application: No
Background Process: Yes
Uses Network: Yes
Uses Internet: No
Hardware Related: No
Memory Usage : N/A ( Free Up Memory )

Spyware: No ( Remove )
Adware No ( Remove )
Virus: Yes ( Remove )
Trojan: Yes ( Remove )
Security Risk ( 0-5): 4
Block/Remove: Use WinTasks 5 Pro to Block/Remove system.exe


Mais comment les enlever? j´ai Avast Spyware Doctor, AD-aware se, Spybot, microsoft anti spy, SpywareBlaster, SpywareGuard et Symantec, mais ils les ont jamais reperer ces trojans!! Mais alors avec kel moyens gratuit que je pourrait utiliser a part downloder WinTasks 5 Pro pour guerir mon pauvre ordinateur? Merci