BUG #11399: CreateUser error when upgrading

The following bug has been logged on the website:

Bug reference:      11399
Logged by:          Kathy Kaminski
Email address:      kkaminski@vidsys.com
PostgreSQL version: 9.0.16
Operating system:   Windows 2008 R2
Description:

I'm trying to install PostGres via InstallShield for our application as a
prerequisite.  I noticed it won't let me upgrade from 9.0.13 to 9.0.16.  I
see the following error:

Error running
C:\Users\Administrator\AppData\Local\Temp\2\postgresql_installer_d64e804b58\validateuser.exe
"." "postgres" "****" : Program ended with an error exit code

My InstallShield installer doesn't know the difference between new install &
upgrade (it doesn't need to, it just invokes the installer), I just pass the
same params to my prereq.

Now, if I try to net /delete my user account, then run the installer, then I
get an error that it won't let me use the password I used before (which is
odd because it will allow it on a fresh install).  I changed the password,
ran through the install finally and THEN can't start the service because of
a permissions problem on the data directory!

I can't think of a way to work around this issue.  Seems that the script
should be smart enough to know it's doing an upgrade and to ignore the user
params.  I tried 9.0.16 & 9.0.18, but in 9.0.18 we can't run the 32 bit
installer because of another bug.

Here's what I'm passing for reference (passwords changed):

--unattendedmodeui none --mode unattended --superaccount postgres
--serviceaccount postgres --servicepassword password--superpassword
password--datadir "%SYSTEMDRIVE%\ProgramData\PostgreSQL\9.0\data"