I have a HP ALL in one windows 8 Machine here. When i start it up after waiting for about 5 minutes it comes up "your pc has encountered an error" and restarts and it keeps doing that. I was told it could either be a operating system issue or the drive could be bad. I ordered the backup discs for the system and attempted to recover the operating system and after putting the disc in, it does nothing indicating the process is starting. I then removed the harddrive and placed it in MY windows 7 machine and got the same error. When i attempted to recover the operating system with the drive in MY system, i could hear the cd rom spinning, but again the process didnt start up. So i then put MY harddrive with windows 7 into the ALL IN ONE system and i got a no disc error (but i know my harddrive works). At this point i am clueless. Is the drive windows 8 on it bad? But why would i get a no disc error when placing my windows 7 harddrive into the all in one system? Both operating systems are 64 bit. Hope this writeup isnt confusing.