Auto-Protect pops up every 5/10 minutes about Trojan.Fakeav and backdoor.tidserv?

So this means something is re-infecting my computer and NIS is blocking it correct?  I am set up to liveupdate and have run full scans on reg and in safe mode and it finds nothing.  I am also getting auto-protect pop ups every 10 minutes about backdoor.tidserv.  I am not on a network.  Running XP service pack 2.  The pop ups are VERY annoying.  Any help with this would be appreciated.  I contact symantec customer service and they referred me to a fee service.  Uh, why would spend $ when I just spent $50 on the software!

 

Oh yeah, running NIS 2010.

Message Edited by Zimon on 11-24-2009 10:10 PM