Be warned though, it might make the game unstable. Fallout 3 is pretty buggy / unstable on Windows 7 as-is. During my last playthrough though, I managed to get it working with minimal crashes by doing a clean install with no mods and disabling Games for Windows Live. When the game do crash though, it only takes a couple of seconds to open the game back up again and continue if GFWL is disabled.
Can't remember about NV though. I remember one of the DLCs having a major bug where I had to use the cheat codes to move through walls in order to get out. Solitude is playing it at the moment so perhaps he can say if he's had any crashes since he started.





