with both prior drives they had become corrupted. And when I rang Currys PC world (where I bought the PC) every time they told me the same thing, which was to reset to factory settings and if it happened again take it into my local store.
After an hour or two of using my PC, It would then shut its self down and restart wanting to restore to an early point where the PC was working correctly. Just in case you are wondering my PC is a Toshiba Satellite L850D, Windows 8.0.