I got the same problem:
W2K sometimes freezes;
but it runs stable for hours using OpenGL-Apps/Games
My hardware:
-Athlon 600MHz
-ASUS K7M
-Creative Annihilator Pro (Geforce DDR)
-Creative SB-Live!
-3COM 3C905B-Combo
-128MB PC100 ECC-Ram
-ATAPI/EIDE-Devices (CD, CDRW, Zip, Disk)
I also tried the nVidia 3.66 drivers but this wont help;
im using the creative drivers now;
I dont see any difference using AGP 1x /2x at all towards stability (my irongate is already stepping c6)
I asked Creative Labs on CeBit, but they didnt know anything from w2k... ("oh this os is very new and blah..." - something like this)
I dont know what to do;
i think if there arent new drivers making my os rock stable out there for the next 2 weeks, I´ll switch back to "good" old NT4;