I installed postgreSQL 8.2 on windows xp and am now unable to uninstall it. I think it has something to do with the user account it created. I don't have permission to uninstall it as a user, and I cannot access it at all as a superuser (security mechanism of some sort to prevent it running with administrative privileges).
The account is created is not visible in control panel/User Accounts as one might expect. I recall that it was part of the domain DEVELOPER, which may mean something to you. I don't know what a domain is in this context.