My PC freezes up when I try to open most videos (You Tube, Vimeo, etc.) in my browser. I am running Vista Home Premium 64 bit, SP2. The problem occurs in both Firefox and Opera. Both browsers and Vista are up to date. My only solution is to power off and force a reboot. The freeze up is not usually instantaneous, as I can sometimes minimize the browser window, start Task Manager, move the pointer, etc., but it usually is frozen in less than a minute. Where should I begin looking?