Here is what the error shows as:
Problem Event Name: APPCRASH
Application Name: Fallout3.exe
Application Version: 1.7.0.3
Application Timestamp: 4a40f18b
Fault Module Name: StackHash_0a9e
Fault Module Version: 0.0.0.0
Fault Module Timestamp: 00000000
Exception Code: c0000005
Exception Offset: 1e868bc3
OS Version: 6.1.7600.2.0.0.768.3
Locale ID: 1033
Additional Information 1: 0a9e
Additional Information 2: 0a9e372d3b4ad19135b953a78882e789
Additional Information 3: 0a9e
Additional Information 4: 0a9e372d3b4ad19135b953a78882e789

My Specs: Intel Core 2 Duo clocked at 2.13ghz
Windows 7 Home Premium
Nvidia 260m 1gb dedicated 2.7gb total
4gb ddr2 ram
350gb hard drive
etc... the rest is unimportant, and i am running off the recommended settings given by the game.

someone tell me please, i need to get to vault 112 without crashing.