Has it always done this? If so, a good reason to exercise the warranty.
I got this problem on my new WIN 7 (professional edition) PC (i7 3370k, 32gb ram, nvidia 650 gtx).
Whenever there is a video or animation (quicktime, flash, opengl or directx stuff) the video and a tiny space around it becomes semitransparent blue. It looks exactly like when you want to highlight the text or image in browser. It does not happen immediately but after few seconds.
I have installed new graphics card drivers, monitor drivers and nothing changed. I have switched off all the aero effects, and all the effects in windows (looks like 98 now), but the problem persists.
This is driving me crazy. Please help.