Vista 5456 x64 Blinking Cursor

Hi there, just tried installing Build 5456 x64 on my machine. After the
initial setup, my system restarts to complete installation... about four
minutes in, my computer yields a black screen with a blinking white cursor in
the top left corner. Leaving it for any amount of time does nothing, and
there is no apparent drive activity. Restarting the computer boots it into
the Vista installation, and then it gives a simple black screen with no
cursor... and no drive activity. Safe Mode only tells me that I have to
restart into normal mode to complete installation. Any insight?

System specs are below. This is not being dual-booted with any OS... clean
install, only OS on the box. Thanks in advance.

Cheers,

MadHatter
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Pentium D 820 (2 x 2.8 GHz)
2 GB PQI Turbo DDR2-667
2 x 74 GB WD Raptor in RAID 0 on PCI Silicon Image 3112 Controller
ATI Radeon X1900 XT
Intel D945PSNLK system board