installing 2.6 on vista64

[DwBear75]

I just downloaded and attempted to install python 2.6.2.  The
installer proceeds to do its work then dies, leaving an entry in the
eventlog:

Windows Installer installed the product. Product Name: Python 2.6.2.
Product Version: 2.6.2150. Product Language: 1033. Installation
success or error status: 1602.

Googling for this I wasn't able to narrow the results down to
something usable. Anyone know of issues and how to fix them installing
on vista 64 (yes, I have 8 gigs of ram)