I think you need to reinstall server. It will prompt you to create an admin user. Don't forgot the password.
Thank you, I tried it twice, but I never got to that point where it prompts for me to setup admin user for Tableau
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.You need to delete your programdata and program files related to Tableau Server
Same Machine Upgrade – Remove existing content
Thanks, it worked now.
Just a heads up, in order to keep the forum clean, make sure that if your issue has been resolved you mark as answered. That way when people scroll through looking to help out they don't stop on posts that have already been resolved.