I'm also having the 0x0000003b error, but it is not random. It occurs every time that I try to run a game (CoD, MoH AA & Nethack). I have a number of other games, but haven't installed them, because it appears to be a losing battle. Since I multi-boot, and haven't had this problem with any other OS, I don't believe that it is a hardware problem. Using CoD as a test case, I tried changing the compatability setting several different ways with no improvement. I added it to the DEP Exclusions...no change. Since it seemed to occur simultaneously with selecting the firewall's full screen option, I tried exiting the firewall before starting the game. That did prevent the BSOD, but the game crashed to a black screen all by it's self. I tried the latest Nvidia driver and then rolled it back to the original Windows 7 driver with no change. I don't know, since not everybody is having this problem, but I have a hunch that it is either the Nvidia driver...or something in the installation of Windows 7 itself.
EDIT: As a side note, I tried experimenting with Nvidia 3D settings, by turning everything on, but that caused a BSOD also. I really don't know anything about those settings, but I don't think that it should have crashed the computer.