The following bug has been logged online:

Bug reference: 1812
Logged by: Donald Bahari
Email address: baharid (AT) yahoo (DOT) com
PostgreSQL version: 8.0.3
Operating system: Windows XP Home SP2
Description: installation
Details:

in the first screen of the installation the user was set to postgres and
asked for a password, which i gave. there was an error message and i changed
the user and password to something i had set up in "user accounts" in
"control panel". in control panel i couldn't set up a user "postgres", but i
could set up a different user(e.g. donbah) with a password and then change
the name the name to "postgres", but the installation gave an error message,
so i had to change the user to "donbah" and use the password i set in
control panel. then i could complete the installation. since i am a beginner
and trying to learn by following from a book, i don't know if its ok to
proceed. i also had difficulty with the "createuser" command.

---------------------------(end of broadcast)---------------------------
TIP 2: Don't 'kill -9' the postmaster

Not much we can say without seeing the actual error message you
received...

Out of interest, which book discusses the postgresql installer for
win32? I wasn't aware there was one out yet :-)

//Magnus


---------------------------(end of broadcast)---------------------------
TIP 3: Have you checked our extensive FAQ?

http://www.postgresql.org/docs/faq