there is a step in the install where it requests a super user password for the postgres repository. I don't see it in your screenshots. When you rerun the installer i would suggest entering a password and saving it for later.
It looks like you're doing a fresh install or at least not an upgrade. You can always remove the C:\Program Files\Qlik and C:\ProgramData\Qlik directories and not encounter previous installations of Sense Server. Let me know if you're still running into issues.