User postgres already exists error message

PostgreSQL Un-Installer does not remove the user account it creates. This causes no end of problems reinstalling the software. The PostgreSQL project will fix this problem eventually. In the mean time there is a work around.

On Windows XP you can remove the user by typing following command at the command prompt:

net user /delete postgres

Enter the command as shown and hit "Enter" key. If the prompt returns:

"Command completed successfully" the user has been deleted. Else check your spelling of the command. If it returns "User postgres was not found" this means that the user is not on the system.

NOTE 1:

Seems that you are reinstalling the software, you also want to make sure that the directory C:\Nautilus\rdbms is no longer exists before you run the installer again.

NOTE 2:

On Windows Vista the deleting users is blocked by the User Account Control or UAC. You must disable the UAC before you run the command to remove user postges.

To disable UAC on Vista do the following:

1) Start page
2) Control panel
3) User accounts and Family Safety
4) Under user accounts, select add or remove user accounts
5) Bottom of page, select "Go to the Main User Accounts page"
6) Select the "Turn User Account Control on or off"
7) Un-check the "Use User Account Control to help protect your computer"
8) Restart computer.

When computer starts back up, fire up the command prompt window and ran the command

net user /delete postgres

Uninstall Nautilus and delete C:\Nautilus directory before reinstalling the software