Before the "upgrade" I had windows Defender running , scanning, finding problems and life was great. After the "upgrade" Defender was off and I could not keep it on. It would be on for about 5 seconds the shut off. Sounds like another virus protection was on but that's not true. Remember, it had been running fine before the upgrade. I am at a loss with what to do. Oh well, I still have my old laptop with win 7. Any suggestions, seems like I have to roll back and start again. No longer a Microsoft fan!