Can’t clean/repair W32.Spybot.Worm

Hi,
I’m kind of confused, I’m supposed to be “protected” by Norton A/V 2004, Spybot and Spywareblaster, but it just popped up a Norton window reporting “rpcxWindows.exe” as being infected by “W32.Spybot.Worm” and it can’t be repaired … if my A/V can’t who/what can?
I’m searching Internet for more info about rpcxWindows.exe but there isn’t any … please your help and comments will be appreciated,