I just noticed that in the upper left hand corner my screen is shaking, I also noticed that as I'm turning the computer off, a bulls eye type image appears in that same corner, is there anything I can do about this? It doesn't seem like the screen is shaking anywhere else, I tried moving the speakers away and there has been no change, thanks for your help

It sounds like somebody has placed a piece of joke software on your PC. It could also possibly be something more malicious.

I would download some spyware/malware scanners and run those. Try Ad-Adware and Spybot: S&D - these are probably the best free tools out there. It might also be worth running these programs in safe mode. Here are some instructions on getting into Safe Mode.

Also make sure you have a good virus scanner running. Two free ones are in my signature.

While I agree with LT, another possibility comes to mind depending on the type of monitor (a significant fact you left out). If it's a LCD (flat panel) monitor, this may be an indication of a problem with the pixels in that area. I would check the monitor manual or the manufacturer's website. About this as well.