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Possibly caused by malware.
Download and install Malwarebytes and update it
Shutdown and boot to safe mode
Run Malwarebytes and do a "Smart Scan" <-- I think that's what it's called
Clean up the mess it finds
Restart
Once you're clean and running OK, think about what AV you are running
I've found AVG Free to be pretty decent, not a big impact on system performance and seems to keep web borne nasties out.
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