Basically my computer has been completely crashing every hour or so and i'm at a loss as to why it's happening. What happens is my computer screen will freeze for about 5 seconds and then it just reboots itself. After it reboots, it has trouble starting Windows, at first i was getting "BOOTMGR IS MISSING" errors, after which i decided to insert my Windows 7 installation CD and try to repair the operating system in case that has something to do with it - though for some reason my SSD (which is where my OS is installed) wouldn't show up under the list of drives in the computer. If i keep turning my computer off and on it eventually works again but, as i said, crashes about an hour afterwards.
If anybody has any advice, it would be greatly appreciated.