iv got a virus

:ocan someone tell me how to clean a virus when avast wont do it i aint had me screen saver on long enough it says its:

windows\system32 win32:Nimba[32]

it says it was last changed on the 13 2 2003 wot damage has this thing done besides muckin up my realone player and takin away some of my send to options am i doomed?? can i delete it ok without deleting a system file or owt ?? help its my first one!!! :cry:

go to this page and you should find your answers to cleaning most virus

http://securityresponse.symantec.com/avcenter/tools.list.html