I have recently installed Vista 64bit to a reformatted HD to finally allow me to use the horsepower I have paid so much for. To be careful, I loaded FSX with updates but no FEX or GEX or any other addons except PMDG 747X. I started at EGNX without traffic but with weather updates and was encouraged to see 25+ FPS in full screen with SLI activated. ten seconds after takeoff and without warning I had a brief BSOD which shut the computer down and restarted it.Am I missing something? Any assistance would be greatly appreciatedRgdsAdrianDell XPS 720 H2CIntel Core 2Extreme CPU Q6800 @2.93Ghz2 x NVIDIA Geforce 8800GTX SLI4GB DDR RamNVIDIA Stripe 1.36TBDell 3008WFP at 2560x1600x32Vista Ultimate 64 Bit SP1

No problem with pmdg and Vista64 and FSX... the SLI is not going to help much since most of the graphics is CPU-based. I am afraid you'll have to try to find the problem within your system.