Red Line in middle of screen on Flash Video for Firefox
I have an issue where there is a bright red line vertically down the screen whenever I try to view a flash video. It is exactly in the center and is there whether I use full screen or not. I have a brand new computer so I don't have previous versions of Firefox or Flash Player. I am currently using Windows 7 (64 bit), Firefox 3.6.6, and Flash Player 10.1.
I have seen plenty of other issues talking about crashes and bad loads, etc., but I do not have any of those issues. Other than the red line, everything seems to play properly. I have tried uninstalling and reinstalling both Firefox and Flash, but no effect. I can view videos without any trouble through IE, so the problem seems to be with Firefox/Flash.
Any help/assistance would be much appreciated.
Thanks
Below is a screen shot of what it looks like.

