I tried 4 times in a row. On the third time, it fixed it but for only about a second, then the screen flashed and it was all fked up again. On times 1 and 2, it just made the problem 100x worse. After those two, NOTHING was the right color at all...
Hmm... I've never known that to not work, that's like my go-to suggestion for this problem...
I
might suggest DOSBox as a possibility? Fallout's not really old enough to necessarily fall into that category, but I have known it to help with some of those older games, regardless... That's kind of grasping at straws for any other ideas that haven't already been suggested, but in theory it might help.