When I click on a folder (not a program shortcut) on the desktop a dialog pops up saying "This file does not have an association to perform this action. Please install a program is already installed, create a association in the Default Programs in the control panel. In file explorer, New Folder is grayed out and ctrl+shift+N does not create a new folder. I have run sfc/scannow and DISM. Also Malware, Iobit Malware and Hitman, all to no avail. I restored to an earlier date. Apparently this is not new, there are many references on other forums, some suggestion fixed the problem, most did not, mine included.