Trojan Vunda

I just installed Norton and got a Virus alert for the TRojan.vundo. I downloaded and ran the tool from NOrton to remove it. I was not connected to internet or network. I disabled system restore and ran the .exe. I said it removed the virus. I then re-boot and ran it again. It then said it removed the virus. The Virus alert still popped up and when I ran the remove tool again, it said no virus found. I re-booted and the Virus found popped up again. Any help would be appreciated.