I believe is a software issue with win 8 disk i had for years. I replaced nearly all hardware mb mem cpu video card psu a hard drive. The only i had not replace is my win install disk which i had problems installing everytime. I took my pc to my local pc repair and said it could a number of things ie hard drive. I told him it will take hours to win 8 . it would locked up and freezes. I had reformated the original drive many times and bought a newer drive same issues too. My pc decides to reboot during download. I dont get bsod just reboots to login screen. I have 64 bit machine and i try to udate to win 10 64 bit os. I need to get win 10 dvd instead.