video freeze

I have a clean install of windows 7 professional, with all driver updates. everything for the most part works well I can play dvds and have no other problems , save this , when I veiw a video online say on you tube , I can but when I go to full screen the computer freezes and i have to do a forced shutdown. I have latest flash . does any one know what is causing that? and also does ctrl+alt+ delete not work in windows 7? as I said everything else works great.:)

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