I just re-installed vista 32-bit. Fallout 3 has worked perfectly for months before this btw. i downloaded steam, copied my backed-up steam files onto the new computer (so i wouldn't have to re-download anything) and then tried to start fallout 3.
this error when i start fallout 3 from steam: Fallout 3 failed to start (error code 51). and this error when i start it from the executable: Application load error 3:0000065432
All of my drivers (especially graphics) are up to date. Google has not helped.