When Windows Explorer opens the THIS PC screen in x32Win10ProV20H2, very often it does not fully populate. The right pane may be empty, or lack only the entry for the system drive – correspondingly the left (Navigation) pane will lack the entry for the system drive. After a while 'not responding' appears in the title bar. This happens only in the THIS PC screen of Windows Explorer, so I can get access to destinations I want, by avoiding THIS PC and using the navigation panel of other Windows Explorer screens. In the Save As window of file processing programs, the system drive is often missing from THIS PC. I'm looking for a SPECIFIC remedy for the problem – general procedures like scannow, DISM, scandisk etc have failed to fix it.