Installation fails on windows vista

I needed to reinstall postgres on a box and so far have had no success. I
have UAC disabled. I enter localhost, password, ask it to create the
postgres user when prompted. The user I'm installing as has admin rights on
the notebook (same user as postgres was originally installed under). I get
various errors that all result in failure. If the postgres user remains from
a previous install, it fails with 'user account exists' (this is weird
because during the prev dialog is said the user didn't exist, should it be
created). If the postgres user does not exist, the installer creates the
user. But then I get an error "internal account lookup failure. no mapping
between account names and security ids was done".

This is windows vista ultimate and postgres 8.2.4-1
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