I have a Gigabyte GA-7VAXP-A board with an Athlon XP 2600 cpu. Several weeks ago it began rebooting at random. This began occuring after I got my machine up to date with its antivirus softare (Norton). Previously the machine would simply hang whenever I tried to play a video. The OS is Windows 2000 Pro. I think that my video card is failing/overheating (it's an nVidia Riva TNT 64 card), but someone that I talked to said it's a virus. Norton has cleaned/quarantined all viruses/worms so I don't give that diagnosis much weight. Any ideas?