So I downloaded Windows 10 on my Desktop and Laptop(using to post). My laptop had no issues what so ever. My desktop on the other hand, the start button stopped working after I restarted the computer. Today I turned my PC on and got this screen. it says Error Inaccesable_Boot_Device I have tried the Automatic Repair, I tried to Restore(Can't no restore points). I am at a lost and atm how it looks my PC just don't work at all. I also tried to Reinstall Windows 8 I get stuck on the screen that you enter your Serial number on won't move past. I am at a total lost.