for my surprise, the game ran perfectly well for the first hour and then started crashing to desktop everytime I approached the Super Duper Mart (or what ever its name is ). On the best attempt so far I actually reached the backside of the building and then the game crashed, on numerous other occasions the game crashed way earlier (I managed to shoot the dog that's running around the area and from that point onwards just a few seconds moving towards the buildung made the game crash).
I then read about several possible fixes like leaving your keybindings at standard which actually solved nothing. Finally, after reading about the possible codec problem, I used Codec Sniper to check if some codecs were broken, but they were all fine. Since I was using an old version of ffdshow, I decided to update it anyway because on my version I could not make exceptions for whether using ffdshow in a certain application or not. I got the latest version from here -> http://sourceforge.net/project/showfiles.php?group_id=173941&package_id=199416 , it was just released yesterday. That alone allowed me to actually go round the building, finding the entrance of the Super Duper Mart, note that I still have not added fallout3.exe to the exceptions lists. That was a major step forward for me since I can assure that this was no coincident because I never managed to get that far with the old version and I always get that far with the new version. Unfortunately, the game still crashs when entering the Mart after I added fallout3.exe as a exception in ffdshow. Which means I am free the run around the world but I cannot enter a building
That information does actually barely help us I guess but I thought I will let you know anyway.
Greets