Hello everyone, first of all I'm going to describe my gaming platforms, as a basis for the rest of the stuff. 1/ Notebook: Win7 64, Intel i3-2310M 2,1GHz; GeForce GT 520M; 4GB DDR3; 2/ PC: dual boot of XP SP3 32 and Win7 64, Intel Dual Core E6500 2,93GHz, GeForce GTS 250, 4 GB DDR2. Ok, I've got no problems with running the games on my notebook or my XP-booted PC, while on Win7 on my PC CM:BB and CM:AK are stuttering and very buggy in display terms. For more info about the problem - few other games that work on my notebook or XP (like Silent Storm) also refuse to work (either graphical bugs or info about "GPU not found/compatible". What can be causing it? My bet is that my PC GPU is unable to work properly with 64x drivers.