BUG #4850: install of PostGIS password error

The following bug has been logged online:

Bug reference:      4850
Logged by:          ALEC TEBBUTT
Email address:      sunsong@dccnet.com
PostgreSQL version: 8.3.7.1
Operating system:   Win XP Pro SP3
Description:        install of PostGIS password error
Details: 

When installing PostGIS 1.3.6 the password for my user "postgres" is
required. My password contains punctuation characters such as caret "^".
These do not seem to be passed correctly to PostgreSQL as the password does
not authenticate. I can login to PG Admin III with that password no
problem.
To get the install to work I had to change my postgres superuser password to
something simple with only normal characters.
Thanks