BUG #5086: Install doesnt work

The following bug has been logged online:

Bug reference:      5086
Logged by:          Pieter-Jan
Email address:      pieter-jan.beckers@hotmail.com
PostgreSQL version: 8x
Operating system:   Windows 7 professional
Description:        Install doesnt work
Details:

When I try to install postgresql everything goes well untill the part where
I have to input my new passwords. At that moment it sais:"The password
specified was incorrect. Please enter the correct password for the postgres
windows user account."

I have no other postgres windows user accounts on my laptop nor do I have
other users.

Can you plz help me out, I need this program in my class to follow with
learning SQL.

Kind Regards