error message when trying to repair

K well i’m having a problem. I have win 2000 and have recently found the Win32:Nachi [Wrm] virus on my computer. it is affecting the dll.host file and svc.host file. Avast says i need to fix the problem when i’m not in windows so i let it restart my computer and it finds the virus when it scans. It then gives me a list of options so i hit option 5 which is repair and then it says REPAIR ERROR 42060. So i can’t repair it. How do i fix this?

I thinks that’s the number of the error message. if not it’s 46020.

HELP!!!

Read here http://securityresponse.symantec.com/avcenter/venc/data/w32.welchia.worm.html on how to remove the virus.