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I ran into a similar issue, I had to re-install python. If you find where PSSE is located in your files then go to the PSSE Installer FIles and continue down the file path until you find python-x.x.xx-amdxx.exe (for me it was C:\Program Files\PTI\PSSE35InstallerFiles\35.6\Python\Python39x64\python-3.9.13-amd64.exe). After the installation, restart PSSE and maybe it will work. I noticed this was an issue when a new user would login and use PSSE. Hopefully this helps!