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BESNOWED

Every now and then, on my MOzilla Firefox browser, I get a web-site popping up with the name something like BESNOWED.STREAM. It then says it's a Microsoft support site and that something is attacking my computer and stealing stuff. It gives a phone number to call and won't let me access the machine.

I always turn off the computer and restart and it goes away. McAfee scans don't detect anything wrong.