A couple things: What brand MB do you have? This determines whether the AGP voltage could be an issue. I also see that the textel alignment is set to 7. This is usually set to 3.
If you don't have much to lose, a reformat would be a good idea. I personally think your driver install got hosed somehow. No matter how hard you work, short of a complete registry run through, you probably won't be able to fix it. (You don't happen to be running Windows ME? If so, I'm sorry. Windows Me, just like I said it would be, is beginning to show just how bad it really is. It's basically win98 SE kernal with 2000's graphics and all the bugs of both combined into one.)
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bloom25
-MAW-
(Formerly of the)
THUNDERBIRDS