I've tried various solutions presented on different forums, as well as following the steps on the STEAM forum, asking me to run both STEAM and Fallout 3 in administrator mode.
I've changed bUseThreadedAI=0 to bUseThreadedAI=1 in the Fallout_default file, and added iNumHWThreads=2 on the next line.
I've tried to run the game in windowed mode and using a program called MaximizedWindow (not that I see how that could cause the issue, but others claimed this sorted their freezing out)
I've tried installing K-lite codec pack.
I've turned off v-sync.
I've disabled visual themes, desktop compositions and display scaling on high DPI settings. I've also tried to run the game as administrator and in compatability mode. (saw somewhere that I shouldn't run the game in compatability mode, so disabled that)
I can't find any other solutions.
Processor Manufacturer: AMD
Processor Name / Type: AMD FX-6100 Six-Core Processor
Processor Speed: ~3.3GHz
Operating System / Service Pack: Windows 7 Ultimate 64-bit (6.1, Build 7601) Service Pack 1
System RAM: 8192MB
Video (GPU) Manufacturer: AMD
Video Card Model: AMD Radeon HD 6900 Series
Video Card Driver Version: Catalyst 12.10
Video Card onboard RAM: I don't rightly know
Sound Card Manufacturer: Realtek
Sound Card Driver IDs: HDAUDIO\FUNC_01&VEN_10EC&DEV_0889&SUBSYS_1458A132&REV_1000
Sound Card Model: No idea