I recently had my computer infected with justice department ransom-ware. I am running windows 8. I have read up on this and have tried using a rescue USB with installed Microsoft defender offline. When I get to boot options and try to select the USB it says the following "USB1 path1 USB 2.0 has been blocked by the current security policy". I don't think that a different USB would make any difference. I don't know what steps to take from here. Any help would be greatly appreciated.