I'm running 64-bit Vista Home Premium, with a Q6600 at stock clock (2.4GHz). No crashes, and I played for over an hour without stopping.
What is your quailty setting for Crysis? The more details we can get the better.
For the records, my details:
Windows 7 64Bit Professional
Pentium E5200 OC'd to 3.33Ghz
4GB DDR3 RAM
Nividia 8600GT 256MB
Medium Quailty Settings
Steam-bought Crysis.
Processor: Q6600 @2.40GHz
Memory: A-Data 4 GB DDR2 800
Hard Drive: WD Caviar Blue 320GB
Video Card: EVGA 8800 GT (core @675MHz ; memory @1950MHz)
Monitor: Samsung 2253BW 22"
Sound Card: Creative SB Audigy SE
Keyboard: Logitech K350
Mouse: Razer Lachesis
Operating System: Vista 64-bit Home Premium
Motherboard: Gigabyte GA-P35-DS3L
Computer Case: CM Mystique
Settings: all High (except sound at Very High); 1680x1050, no AA, vsync off