Garbled Premiere Pro interface

Did you use the Cleaner Tool?

https://helpx.adobe.com/creative-cloud/kb/cc-cleaner-tool-installation-problems.html

When uninstalling all files are not removed. I would try some brute force by doing this:

1. Close Premiere Pro
2. Go to C:\Users\UserName\Documents\Adobe\Premiere Pro
3. Delete the subfolder named 15.0 (If you are using verion 15.x that is..)
4. Launch Premiere Pro

When lauanching Premiere Pro those folder will be recreated and since the Workspaces "live" in those folders there is a chance that any corrupted file is history.

Mind you that if you delete that folder your custom workspaces and custom keyboard shortcuts will be deleted as well, so cutting out the folder (Ctrl+X) and place the folder on the Desktop may be a better solution to step 3 so you can save the files you want.