Hey, I had a problem once where I couldn't change my view from spot. I tried re installing (didn't need to) and fixed the problem after removing the files below.
SO, I THINK these are the files you need to backup. Somone correct me iff'n I'm wrong. I'm using MS OS 07.
C:\Users\your name here\Application Data\Microsoft
The files are cameras.cfg and flight.cfg. and ContentErrors.... (not sure if it's necessary to save the ContentErrors file... but i did anyway.
IF you can not see your "Users" folder, you may have to make a change to the files you're able to see (security settings i think).
I've made a LOT of progress and I'd hate to lose it all again as some of the challenges are really quite hard!