Fallout 3 freezes

Hello,

I have just installed Fallout 3 and it runs smootly 60 fps

BUT

every 3 min its freezes.

First the screen freezes for 2 sec then the screen turns black for 2 then it says no input signal then it minimizes then the game runs again

I realy dont understand what the problem is every driver is up-to-date

This problem happend also 1 month ago on GTA4 but only for 2 times

rig:
NZXT Apollo case
Asus P5Q pro
Intel Core2Duo E8400 oc to 3.6
Zalman CNPS9700 NT cpu cooler
4x 1gb corsair
ATI Sapphire HD3870 oc'ed
2x Samsung spinpoint 640gb
500w chieftec psu

Either that ^or there is something kicking off in the background.

It's probably just too much for your video card to handle.

I know this is old, but this is for anybody that is looking to solve the freezing problem problem.

This constant freezing has driven me nuts the past few weeks and nothing worked (FFd show didnt even work nor fresh installs), but I think I found the problem If you have windows live installed and enabled (in the game) make sure you go to window firewall and put the Fallout in private and public settings. I have found that windows firewall blocks windows lives' outgoing connection (go figure right) causing the game to freeze and crash (including mini freezes).