Probably kind of late now, but I had a virus causing me problems. I tried several Anti-Virus programs to get rid of it. Freedom Anti-virus found it but couldn't eliminate it. I could SEE it in a folder on my C drive. Norton 2004 Anti-virus simply suggested I EXCLUDE it from further scans!!! Then I downloaded Spybot - Search and Destroy, a FREE antivirus program, ran it, it found it and it deleted it! No problems since. I would recommended Search and Destroy to anyone.
I now have Freedom Antivirus and Firewall; Spybot Search and Destroy (free); ZoneAlarm firewall (free); Ad-Aware. All working together.