BUG #4581: Difficult uninstall

The following bug has been logged online:

Bug reference: 4581
Logged by: Henrik Svensson
Email address: henrik(dot)svensson(at)mydata(dot)se
PostgreSQL version: 8.3.1
Operating system: Windows XP SP2
Description: Difficult uninstall
Details:

To remove PostgreSQL so you can reinstall it to my findings the following
must be done:
- Do "Control Panel" "Add Remove Programs" select "PostgreSQL 8.3" click
"Remove". That's normal.
- Delete all files (still remaining??!!) under C:\Program Files\PostgreSQL.
- Remove the service-user postgres. The reinstall can't handle that this
user exists (?!).
- Delete all fields in the registry containing the substring postgre
(???????????!!!!!!!!!!!!).

I bet there is a simpler way, right?