Had Win 8 and upgraded to Win 10. Did not like and reversed out, Win 8 was gibberish after the reversal. So I decided to use Wipe Drive to clean HHD and a fresh Microsoft disk to load Win7. I get this error message "OS not found" any way I.try to load the software I have used Wipe Drive before and never had a problem downloading an OS. All the F keys.produce the same error message. Would appreciate a little hand holding to load an OS.