Then it could be other issues associated with your computer.
I assume you have check the link Check your computer's ability to run ArcGIS Pro 2.9.
on ArcGIS Pro 2.9 system requirements—ArcGIS Pro | Documentation
It will check your system capabilities but not other technical issues.
Tech Support is your best option if reinstalling doesn't work since you probably have other software conflicts that need resolution
... sort of retired...