How do I reinstall Windows Defender to my Windows 7 Professional. It kept crashing, so I uninstalled it (And it DOES uninstall!) with the idea of reinstalling it.
But when I try to reinstall, the program insists that I already have it, and cancels the reinstall! It appears listed on my computer, but when I try to start it, the program says, correctly
Windows Defender does not exist as an installed service.
Nonetheless, when I try to reinstall, the install program insists that it will not install, on the grounds that the program is already there. But it is not. Is there any way I can reinstall it?