Disk boot failure then BSOD

I have a modified HP Media Center Edition. My dad was on it and said that it crashed with a BSOD. When I rebooted it said Disk boot failure, insert system disk and press enter. I inserted the Windows 7 64 bit Ultimate installation disk that I had used to install this copy and the computer booted. Thee black screen with the windows logo showed before the computer did another BSOD. The message read: PAGE_FAULT_IN_NONPAGED-AREA. I booted the computer again and attempted to do a system repair but it said that the problem could not be repaired automatically. I was unable to do a system restore because it said no image was saved. I keep getting the BSOD every time I attempt to boot. I have not recently added any new hardware and there is nothing in the USB ports. Does anyone know what the problem might be. Thanks for your time and help.

First thing I'd look at is memory and hard drive. Check the manufacturer's website for any diags.

In the process of troubleshooting, you'll want to disconnect all but the drive that's running the memory diagnostic to make sure you're booting into it. Then connect your main hard drive (assuming more than one) and run the hard drive diagnostics.

The reason I'm thing hardware is because you don't seem to be able to boot to the installation DVD to attempt a repair.

Well almost everything has been replaced. New HD, new graphics card, new memory. And I'm not too tech savvy. Those replacements were done by a friend who is much better with computers than me. I'm not sure how to disconnect the drives. So would you recommend taking the computer to him to fix?

If he put it together for you, he should know how to troubleshoot it.