It's a virus.
Scan your PC with your anti-virus program of choice.
If that doesn't work,
Restart your computer.
If that doesn't work,
Turn off your PC and wait for 5 minutes, then turn it back on.
If that doesn't work,
Turn it off and take it to a computer technician and have them fix it.
For more info, watch this instructional video: http://www.youtube.com/watch?v=BB1a5Sv4cP8
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