How Come Videozer, Gorillavid, And Videobb Stopped Working?

i've been watching a lot of videos online using the three sites listed above lately. suddenly my computer closed everything and all my desktop icons and start menu list cleared. i went back thinking it was just an error but i found that the three sites above no longer have video i can access! (where the video should be is a square with a tiny "x" in it) also i keep getting a tool bar appearing that says "Interntet Explorer is currently running with add-ons disabled. Click here to manage,

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