Vista install fails after a while

Apologize if this has been addressed, but I did not find my exact problem. I
have a Windows Beta 2 Vista install disk from Microsoft and have tried to
install from it 3 times without success.

I put in a new SATA2 250-gb drive just for Vista and chose it for the
installation rather than do an upgrade to XP. I have XP Pro on my C: drive
(IDE). Installation seems to go normally through Copying Files, but
somewhere after 30 minutes-plus (I have not sat here and watched it), the
instllation quits and XP loads. The first time I had a message that Vista
failed to install, but there were no details. The other two times, no
message, just boot to XP.

Windows' advisor says my machine is ready for all Vista tasks except TV
capture and viewing, which I do not do anyway.

Anyone seen the same problem I have?

Thanks in advance!
--
Jimmy Parsons
Asus P5GD1 m/b
P-4 2.8-ghz
1-gb RAM
Sapphire ATI Radeon X300 PCI-E video