Vista 64 Installation Problem-Sent to x: at reboot

Hello. I've searched the posted installation problems and havent seen this
one. I downloaded and burned the ISO of vista 64 and installed over my xp pro
64. The installation appeared to be going smoothly when the screen froze
reading "Installing Windows" and the computer rebooted. Upon reboot, a gray
status bar runs like windows is opening then a blue/green background screen
opens with a black command prompt screen reading
x:\$WINDOWS.~BT\Windows\system32>

I've tried to boot from the DVD with no luck. I've even tried to boot from
my XP 64 DVD and it will not work. It reverts to booting from this x: drive.
It wont allow me to access my c: drive (hard drive). It says it does not
exist. I think it renamed my hard drive x: Anyway Im stuck at this point and
cannot use my computer. Any suggestions?

Thanks.