I have a GeForce 6600 GT (AGP 8x). I had finished the tutorial and it was sitting at the victory report (not the big one, but the small one)and I went to do something. During that time my screensaver came up (starfield). I have two person switch to desktop (wife and I) and clicked on mine to go to my desktop and I got a complete black screen. Waited a bit to see if it was just taking time to redraw. No dice. Then brought up Task Manager to try and terminate. I saw the 'ageod' was running. Tried and Alt-Tab just to see if it would switch back. When I did this, I saw the bottom tool bar show up with 'ageod' mininmize I guess (and the Task Manager). No mouse cursor was viable during this time, so I tried various key combos (alt, shift, cntrl with a letters) and nothing seemed to work. But on one such occasion, I finally got a small, grey box with the following (and my mouse cursor appeared too):
DirectX to Renderer invalid call (Burst Mode).
Would you like to terminate application.
Then in French for 'yes' and 'no'. I clicked 'yes' and my Desktop reappeared, and program (BoA) had been terminated.
I believe my driver's are one back from current (i.e. 81.85) having tried the current with some problems (81.95). But to be honest, in trying to solve some problems, I may have ended up with 81.95, but can't remember and can't seem to find how to exactly verify that on my system (if it matters).
The Tutorial btw, ran just fine.
(and I've been playing other games just fine).