If I leave my computer on for 12 or more hours(even if it is not being USED) and then I try to play the mmorpg game Dungeon Runners I will get a internal video card error. I f I shut down or hibernate for 2+ hours in that time period EVERYTHING is fine no matter how long I play. This fried my first card and I don't want it to happen again. I have an E-machines AMD Sempron 3000+, Geforce 6200A video card, 1 GB RAM, Windows XP.There's a very old joke that says the guy goes to see the doctor, and says, "Doc, it hurts when I do this." ::: you move your arm or something to illustrate ::: The doctor replies, "Don't do that anymore."

Forgive my poor humor. You'll most likely get a better answer than what I'm going to provide, but I've known people who have peculiarities with their systems when they just leave them run. The problems go AWAY when they reboot, and the operating system has a chance to put things back in order.

You don't need to justify your computing HABITS to me. Perhaps there are reasons you leave your system run all the time. (I know people who run applications in the background, and there are many projects to which one can donate computing time.)

Should the system do what it's doing? No, so I understand your frustration.

Do you periodically run any sort of software to "clean" or optimize the system in any way?

It might also be suggested that you check your video drivers, and update to the LATEST if you can.
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I will get a internal video card error