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[Cthulhu]

So this weird issue hit me a really long time ago.  I would be playing a game(Always 3d, but not all 3d games), and suddenly I would get really bad framerate, like 2 or 3 frames per second, for like 30 seconds.  When it did this, I would lose anti-aliasing for the duration of the issue, so everything would be all jagged.  It would usually get worse a few seconds before it went away.  This would happen about every thirty seconds and then it would go away.  I first noticed it in Lugaru, but I remember it happening in other games too.  After trying some different things I noticed I had the svchost.exe memory leak.  After rectifying said situation and cleaning up my hard drive a bit, the problem went away.  Now, it seems, it's back.  Does anyone have any idea what this could be?  I'll list some games it happens and doesn't happen to, in case someone knows something common to one group.

Does:
Lugaru, Team Fortress 2, Il-2 Sturmovik, Audiosurf, Red Orchestra, Some others I can't remember at the moment.

Doesn't:
World of Warcraft, Dawn of War

[Cthulhu]

No one at all?  Update though, it also does it in Left 4 Dead and Medieval 2: Total War

[A_Fey_Dwarf]

All I can recommend is rolling back any recent driver updates for your graphics card. I am not even sure if that is possible...

[woose1]

Huh. I remember that my old OS computer, like windows 98, had this.

Now of course, that thing's aincient, and it might not help you here. Plus I only ran a few 3D games.
If it is shutting off that feature, I recommend not using anti-aliasing at all. As far as I can remember, Total War always has huge dynamic dustclouds, and maybe that is the problem?