Hey guys great thread. I am going to try a couple of things above , but my issue is a little different; I did a clean install of Win 7 Pro 32-bit. I re-installed FS9 and immediately crashed at FS startup with a BSOD memory dump. I added Administrator rights, compatibility with Win XP, installed in a different directory, etc. to no avail. So I reinstalled using default file paths, did not update to 9.1, did not install FSInn or SB. After running the fs9.exe, the sim worked well for a few days. I added SquawkBox4 and conducted an online flight and everything worked well. 2 days later I tried to fly again and the sim did the same thing; at splash the screen went black and immediately repeated the same BSOD/memory dump. I have yet to get it to start since then. My drivers are current and clean. I updated my PC to 2GB RAM for the OS upgrade, (old Gateway System) I'm running a ATI Radeon 9250 Graphics Card, 2.4 ghz P4 processor. I previously ran XP SP3 before the OS upgrade and FS9 ran fine except a low frame rate due to my previous RAM. Win7 is a great system and I don't want to downgrade for FS. I will try the items above that I haven't done, but it strikes me as funny that FS9 worked well for several days, and then crashed again. No updates were downloaded in that time frame. I added an additional pc to my wireless network which has no bearing on my FS pc. Any insights? I will update this week when I go through the steps above. Thanks.