just installed it and the game crashs with in seconds of the games splash screen start up

I am running intel core 2 quad 2.9 ghz, on a EVGA 780i sli ftw with 8gbs ram, 2 nvidia geforce gtx550 ti with 2gbs of gdr on each card running in sli, a realtec on board soundcard (not sure wich one) window 7 - 64 bit. I have a feash install and everything is updated....Help..I really like this game

Do you have any mods installed? Do you have the latest patch installed? Did you install from Steam or disk?

Did you cut you cpu back to only 2 cores. If you installed from a disk, did you install the game outside the Program Files?

no I didnt limit core usage, and it is installed on my D drive (that is where I put all my games)
where would I learn about core limiting? please post a link to it

Since you installed your game on your D drive, the path to the game should be D:\Bethesda Softworks\Fallout3\Fallout3.exe. I don't know where you can get the tweak to limit the cpu to two cores, I have a dual core cpu and never paid attention. Just check through the forums here and at Fallout3Nexus. You also need to have the 1.7 patch installed.

1.7 is installed

fixed...the ini edit worked