It sounds like you got hit by one of those random "ransomware" type ads. It isn't necessary to turn off the PC when these hit, just open your Task Manager from the Start button (I can get to this in win 8.1 just by right clicking the Start button), then right click your browser in the task list and choose "End Task".
This will shut down the browser completely, overriding whatever malicious code that has frozen your browser. You are then back to the desktop and can resume as normal.
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So much porn, so little time...
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