How to uninstall PostgreSQL Server on localhost and reinstall with new user and passw

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On Windows 7, I'd like to install a brand new, fresh installation of PostgreSQL/PostGIS on a laptop, and wipe ALL the localhost servers, users, data and passwords clean, and then reinstall as if it had never been installed before. I have QGIS 1.8.0 running perfectly, but I'd like to create a PostGIS database. However, an idle and unnecessary installation already exists that I'd like to clean off or reset the password on.

I've done an 'uninstall' of Postgis, and then PostgreSQL, but that didn't remove the network service and former postgresql user. Reinstalling requires the same password and user as before, and so I'm stuck.

If there is an easy solution, without reinstalling Windows 7 or QGIS 1.8 (osgeo4w) then I'd like to go that route. What should I do in this situation?



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