Did all of the steps in the uninstall complete successfully?
Do you have any databases you want to keep? If not, and you didn't already delete the PostgreSQL "data" folder try doing that during the uninstall.
If you want to keep your existing databases, or you already did that or it doesn't help, please open a Support ticket and include a link to this thread as a reference or re-post your question and one of our support techs will work with you to get things sorted out.