Im desperate. I have a Gateway Desktop machine with "XP home edition". I have virus on it:

"WORM AGOBOT.BQ" C:\Winnt\system32\svcvhostp
"WORM AGOBOT.GEN"
Only TREND MICRO´s "Housecall" (online virus scan) can detect it but not remove or repair it since the programs are running.

I have tried:
Antivir - (updated but couldnt detect it)
AVG - (updated but couldnt detect it)
Norton antivirus 2003 - it has been disabled automatically and I couldnt start it again - seems like it was the virus that did it in order to protect it self).

The Virus shuts down my computer from time to time with a 1 min. warning "Remote Proceedure call".

Can someone help me?