Hello and thanks for downloading this quick Windows 7 Fallout 3 patch, this patch was designed using already included options from within the Fallout game that reduces
the amount of power your PC uses when running the game, before the game was trying to use 100% of your PC's power though was not designed to run on modern PC's.

This fix was designed and published by steam user "Stoop!d Monkey" and the full post on how to manually fix the issue can be found here
http://forums.steampowered.com/forums/showthread.php?t=1328904

To install is simple, First...
Navigate to C:\Users\username\Documents\My Games\Fallout3
Drag the content of folder "Fallout3Fix" into this file and overwrite when asked (Remember to back up the file "Fallout.ini")
Start the game and the crashing should be gone, if not repeat steps above but instead use the file in folder "Fallout3FixPatch"

To uninstall and restore the settings to their original state you can either delete the file called FALLOUT.ini or drag the contents of "Fallout3FixUninstall into
C:\Users\username\Documents\My Games\Fallout3

NOTE: ONLY INSTALL THE PATCH IF THE FIRST FOLDER FAILS TO STOP THE CRASHES!