Just a heads up really had this twice today on my works laptop and home PC and it disables you from accessing the net and opening any programs.

If you do get it go into Internet tools, Internet Options, Connections, LAN settings and uncheck the proxy setting box.

Close PC down and re-start in safe mode (pressing F8) and select safe with network. You may have to do the above procedure again to access the internet

I installed malwarebytes and cleaned it and rebooted however on my home pc I just chose a restore point from a couple of days ago

It worked and I'M up and running but I know a guy at work spent 7hrs trying to sort it out!