Unable to install windows 7 Ultimate, 64-bit

I'm trying to install Windows 7 Ultimate, 64-bit on my desktop. I reformatted the harddisk and booted to the DVD. I've already checked the compatibility and was previously running Windows 7 Ultimate, 32-bit. In the computer properties, it did say that the processor (AMD Athlon 64x2) is capable of running 64-bit. When I boot to the DVD, it goes through the process and seems like it is working, but after a few automatic reboots, it just black-screens. At that point, if I reboot, it just black-screens again it.

I am able to put 32-bit back on it, and it installs without problems, but am trying to get it setup to run SharePoint dev tools. Is there something additional I need to do to install 64-bit that was running 32-bit?
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More about unable install windows ultimate
  1. The processor may be OK for 64 bit, did you check that the motherboard and video card have drivers that will work?
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