Whenever I try to enter (autosave occurs) or quick save near the Radio Tower Complex, SW of Oasis (the mission to find Eli & Eric (?) sends you there), I receive the following crash error:

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: 002d37ec
OS Version: 6.1.7601.2.1.0.768.3
Locale ID: 1033
Additional Information 1: 0a9e
Additional Information 2: 0a9e372d3b4ad19135b953a78882e789
Additional Information 3: 0a9e
Additional Information 4: 0a9e372d3b4ad19135b953a78882e789

I can quicksave at the Clifftop Shacks, and over either rope-bridge, but as I get closer, it takes longer periods of time to save, until I am within 30m of the door. Once I am close, the game results in the above crash. Win7.