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#11
Simple fact is you have a hardware problem. More then likely the hard drive is failing. Since you haven't bother to state Why you did the Reinstall the first time but I can guess it was because of system freezes or BSODs. You need to do whatever anyone on this forum asks you to do to Test the Hardware in your system.
The reason I think it is the hard drive failing is because you said it ran fine for about an hour then Froze and now you can't boot the system to the welcome screen. To me that is a sure sign the drive has gotten corrupted and that doesn't happen unless there is something wrong with it. If it was a RAM problem it most likely would of shown up when you were doing the Re-Install.