(You never answered the other questions dl65 put to you, either.)
He asked a lot of questions...
About the warranty: If it's busted and I want my money back I can't exactly mess around with the graphics card. At least, I don't think I should in case it voids it.
About my memory: 512 megs of ram. All I can read on the stick itself is "VData Memory Experts"
Make, model? My graphics card is ATI, that's all I know... and I've already told you what my mobo is.
Operating system is windows XP with service pack 2 installed, fully updated as far as I know.
And it occurs with all games, I assume, the only games I tried were "World of WarCraft" and "WarCraft III: The Frozen Throne".
I hope I've been informative enough :S