Doesnt sound like theres anything wrong with the install disc and it would reject the key when you type it in if it was that, and its unlikely to be the hard drive, sounds more like theres a problem with your ram, go into bios and check the timings are the same as those printed on the ram sometimes the bios will load the wrong timings, if they are ok take ram out and try one stick at a time in the different slots one of the sticks has probably gone down.
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