can hear videos but can't see them

I have win 7 pro, ie 9 and v11.6.602.171 flash.  in the last week or two I have noticed a "buzz" along with a pause in sound and vid action.  in the last few days I have lost all videos in sites like msn,comedy central and others. I hear the vid but can't see it.  It looks like there is a lot of his going on, Anyone know how to fix it? I have tried most of the fixes I have found on this site and nothing seems to work