Hi yeah...hold one tick bro before you format, what virus is it?
You may be able to download a tool just for this virus (what ever it may be) which will remove the infection,
One other thing well few a turn off you system restore point if it's on (as the virus will or may well be here to) then run your antivirus or virus tool.
If supportted try running in DOS some anitvirus allow you to run in safe mode and in dos.
As you did not list your so called virus we can't go into any indepth detail..Some programs are over active when scanning for virus etc yours may be the case.
Anyway look here as one source for
removal tools
Good luck.