Trojan.Vundo issues.

Hello.

If someone could resolve my problem, I'd be incredibly thankful...

 

I have received and removed the security risk "Trojan.Vundo" several, several times, and it keeps returning. I  am unable to go back and just do a system restore as all of my other points miraculously dissapeared...

 

I have tried removing it via the registry, with NIS, and with Symantec's Vundo removal tool, it keeps coming back.

 

I am running Windows XP Home Edition with Firefox as my main browser.

 

Anyone want to help?