When I run Overseer on my Vista, the sound works, but every video is tinted green and and displayed on two screens side by side.

See Photo: https://docs.google.com/document/d/1d-XY-be77Zj8q0-DuacRLVx9euk0gEbDoTt2tPGw_6w/edit?usp=sharing

I've tried changing the compatibility settings, settings withing the game, and installing a new version of FFDshow, but nothing seems to work.

Any suggestions would be much appreciated.

Well, as it turns out, I managed to solve this problem myself by installing a new version of ffdshow and uninstalling my CCCP. (Although I thought I had already tried a new version of ffdshow, I guess uninstalling my other codecs fixed the problem.)

Anyway, free rep for the next person to post in this thread.

I have the same problem and installed a new version of ffdshow. This alone doesnt work. What is CCCP and how is it to uninstall?

CCCP is a codec pack.

Conflicting MPEG2 codecs are reason for that green view. I had the same issue and removing bloatware called PowerDirector (which had installed it's own codecs) solved my issue, but in your computer it might be different codecs which are causing the issues So, try removing all other codecs.