"Brian Adams" wrote:

I have burned the final Vista ISO image from my MSDN Subscriber Downloads and
installed it. I have tried XP Upgrades and clean installs on several
different drives. It appears to install/upgrade successfully each time.
When it does the initial reboot I get the error: "A disk read error occurred
press ctrl-alt-del to reboot" every time. What are the BIOS requirements for
Vista? Is it possible my machine is too old? I have a Dell Dimension XPS
T800r. I have downloaded and installed the latest BIOS (A11) from Dell's
site and still no dice. My machine [barely] passes the Vista Upgrade Advisor
tests (800MHz, 768MB RAM, GeForce 5500 FX).

I have the same problem on a similar machine Dell Dimension XPS T600r and
cannot find any way around this problem. I think maybe the machine is just
too old for Vista so maybe time to upgrade to a higher spec. PC.