Either your card or your monitor may be in the process of dying:
What you describe sounds like a video problem.
Try running DXDIAG and test the direct draw.
You might even have a bad directx file.
I would check to make sure your system is clean of any dust in the back where the fans are. Some graphic cards have their own fans make sure these are all clean.
This is something most people overlook but clogged fans and grills can cause overheating and a lot of other strange problems. Use caned air to clean the grills and fans with. If after you clean everything up you still have problems. It could be either a monitor or your video card
going bad. A monitor problem should show up on other applications. Where a bad video card might only show up on programs like FS that uses it a lot.