I tried to install postgresql-8.4.0. I didn't turn off User Account Control before doing that, which seems to be recommended. I think Postgres tried to create a user account called 'postgres', but it failed (I suspect because of UAC). Postgres installation could not finish normally.
When I look in the Control Panel\User Accounts, no 'postgres' user is visible. When I try to create a new user called 'postgres' however, I get the following error message:
The specified account name is not valid, because account names cannot contain the following characters: /\":'|< >+=,?*
Please type a different name.
It looks like I'm stuck with a corrupted 'postgres' user. Is there a way to clean this up?