Salem

Hey guys I had a friend of mine to play salem. He can play but everything looks very messed up to him. http://i.imgur.com/JiuIrLW.jpg
Any idea what is the cause of the problem, but more importantly how to fix it?
If you need extra information on this please let me know as I do believe somebody somewhere had the same problem and found a fix. I just can't find the topic

He needs to check for video driver updates. If he is using beta drivers, then he should revert to the last official drivers for his GPU.