I'm running Windows 10 Pro.
Just in the last hour or so I cannot get File Explorer or Chrome to open.
Other apps, e.g. Firefox, Edge and MS Access, all open OK.
After clicking the icons on the taskbar I can see the "previews" of these apps - so they are starting up, but not displaying the full GUIs.
I have rebooted.
sfc /SCANNOW does not report any errors.