I have installed fallout new vegas without any trouble but I can't seem to get fallout 3 to install can anyone help I need some ideas I am starting to think that it the game but I would like some feed back the thing is it installs but won't allow me to play at all once i hit the play icon the screen goes black like it starting and then the computer just say that fallout has stopped working I don't know what to do and on another note I haven't been able to put in the cd key and i svck at comps

I know I have an AMD Phenom™ II X4 830 Processor 2.80 GHz

Installed memory (RAM): 6.00 GB

64 bit OS

ATI Radeon HD 4200

so please someone help