It looks like you found your answer in another thread, but just in case anyone needs it:
For uninstalling SQL please follow these steps:
-Download Revo Uninstaller and use it to uninstall PostgreSQL. After it uninstalls it will give you options to select and delete all the associated registry entries.
- manually delete the Program Files\Postgresql folders
- run the command - start > run > cmd >
net user postgres /delete
- install again, with your firewall uninstalled or turned off if windows firewall