I thought it could be a RAM problem so I performed a memtest, but after one pass no error had been found.
My GC is a GTX 285 with the latest drivers from nVidia website.
Sometimes I could see an information tip at the bottom of the screen in Windows after hitting Ctrl-Alt-Del, which mentionned a graphic bug that had been fixed. Sometimes I can play 20 minutes without any problem, and sometimes it occurs every 10 seconds or so. I guess it would eventually crash if I played long enough). It occurs for Portal, Portal 2 and HL² (for HL², it has never really crashed, but the textures do the same. So I don't have to kill the game, but it's boring. The game is minimized, I maximize it and it works again.
When this occurs, I hit Ctrl-Alt-Del which summons that blue screen, and just press "Cancel" which takes me back to the Desktop. When I play, after a while, the textures in the game begin to "flicker", some artifacts appear on the screen (like wild triangles) really really fast, the textures on the walls for example disappear and appear back very quickly, and then suddenly the game crashes, with the graphics stuck on the same frame and the audio playing the same 1/10 sec over and over. I'm currently experiencing some problems with my PC which prevent me from using my games (I'm trying with Steam games and none of them works as it should).
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