Joe, Per the Microsoft website:
"Installation limitations
There are two installation scenarios for Windows Vista Beta 2 (and RC1):
1.. You can do a clean installation. This process will overwrite any data
that you have on your hard disk or on your installation partition. The
overwritten data will be lost and unrecoverable.
2.. You can upgrade an existing installation of Windows XP.
No other installation scenarios are supported. Upgrading to this beta from
any other edition of Windows requires a clean installation, as described in
option 1.
In addition, once you install Windows Vista Beta 2 (or RC1) you cannot roll
back to the previous operating system installation—you will either have to
acquire and install the final released edition of Windows Vista or reinstall
a previous edition of Windows. Before installing Windows Vista Beta 2 on any
computer, please remember to back up all your files.
Sounds like there is no way to "Uninstall" Vista
Gary