In desperate need of computer help

[Great Rumbler]

Here's the problem: My computer has been infested with the incomprably evil SVC Host virus. In an effort to get rid of it I tried various methods I found on the internet, none of which worked. I have at this point formatted my computer AT LEAST 6 times and yet the virus comes back every single time. I have even low-level formatted my hard drive and right after I re-installed Windows I installed Norton Antivirus and the XP Service pack. Everything seemed to be going okay, but, somehow, less than a day later the virus is back up and running. I don't have a clue how I can fix this. The only sollution I can come up with is to buy a new hard drive, but I really don't want to do that if I can avoid. So, if anyone knows what to do about the SVC Host virus I would really appreciate your help.

I really wish I knew who made that virus, because I would go to their house and punch them right in the face...