Unsuccessful upgrade to Vista - Successful rollback to XP

The advisor tells me I have no issues that will prevent me from upgrading. It
said after the upgrade to update my intellipoint software and my messenger
program. There were no hardware conflicts. So now I get all the way through
the upgrade for the third time and I get the starting Windows Vista for the
first time screen. Next it goes back to the Completing Upgrade and then I get
a quick blue screen that says at the bottom Dumping Memory and a reboot which
prompts a rollback to XP Professional. Thankfully that is successful. I have
been in the Windows Root Folder
( C:\$WINDOWS.~BT\Sources\Panther\ ) and found several log files but, I do
not know how to decipher these. I see the time of the failure but do not know
what caused it.

Any guidance would be appreciated.