By the look of it, it seems to be a html ransomware called "browlock". Its just a tricky piece of javascript that creates a 150-iframe-loop to make you think your browser is locked. Usually, turning off javascript and closing the browser (or actually clicking "close" 150 time) should do the trick. There's no malware per se installed on your machine. (IF i'm right, and it is the typical browlock fbi-moneypak-scam).
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