Hello, and I desperately need some help with my HP Envy 15 Notebook PC. I have owned it for almost a year, and recently I had upgraded my Desktop computer to the Pro version of Windows 8.1. This notebook had come with the core edition of Windows 8.1. So, I decided to use my product key on this PC, so I could have the Pro version of Windows. I had forgotten that only one PC can use a product key at a time, so it deactivated my windows. Because of this, I backed-up all of my files to a Passport Ultra. Then, I restored my computer to factory defaults. After setting my PC up again. It said I could upgrade to Windows 10. I did, and didn't like it, so I went back to 8.1. After this, I decided to take all of the stuff I had backed up and upload it back to my computer. I took my Software.reg file from the back-up and whenever double clicking it, it just said that it couldn't be exported to the registry. So I decided to copy-paste it there. Then, I wanted to listen to the music I had backed up, so I uploaded it to my PC and it appeared. I looked at artists, then back at music. It was gone. I should've just relaunched Windows Media Player, but I rebooted. Then, after the reboot, I was greeted with a Please Wait... I did, and 30 secs. later, I was greeted to the lock screen. I swiped up, expecting to see a password prompt, but I didn't. I got another Please Wait... I did, and 30 secs. later, back at the lock screen. I was wondering how I could fix this. I will be very grateful to whoever does, and I will constantly be online. (I really want my PC back.) Thank You.