Error details below:

Problem signature:
Problem Event Name: APPCRASH
Application Name: Fallout3.exe
Application Version: 1.7.0.3
Application Timestamp: 4a40f18b
Fault Module Name: Fallout3.exe
Fault Module Version: 1.7.0.3
Fault Module Timestamp: 4a40f18b
Exception Code: c0000005
Exception Offset: 00227180
OS Version: 6.1.7601.2.1.0.256.48
Locale ID: 1033
Additional Information 1: 0a9e
Additional Information 2: 0a9e372d3b4ad19135b953a78882e789
Additional Information 3: 0a9e
Additional Information 4: 0a9e372d3b4ad19135b953a78882e789

Read our privacy statement online:
http://go.microsoft.com/fwlink/?linkid=104288&clcid=0x0409

If the online privacy statement is not available, please read our privacy statement offline:
C:\Windows\system32\en-US\erofflps.txt


------------------------------------------------------------------------------

For some reason this error doesn't occur when running fallout 3 in windowed mode, but I can't stand playing in this mode.

-----------------------------------------------------------------------------

PC Spec:
Graphics card: Nvidia ENGTS450 1GB DDR5 (ASUS model)
CPU: AMD Athlon II X4 Quad Core processor 3.0Ghz
Ram: 4GB(2x 2GB sticks) DDR3 - G.Skill Ripjaw Series
Power supply(PSU): 535 watt power engine
Boot hard drive(Only Windows is on this HDD): 80GB 7200RPM SEAGATE
Main hard drive(used for everything but Windows): 500GB 5200RPM SEAGATE
Motherboard: ASUS M4A87TD/USB3
Operating system: Windows 7 Professional 32-bit
---Average FPS on Fallout 3 on ultra settings is 60 fps (I think Fallout 3 limits it at this)
---Fallout 3 was bought through steam

Are you running a strict clean boot? No IM's, no AV, nothing else running.