My printers (a Samsung and an HP) along with the Fax, XPS Document writer - everything - periodically disappear and when I try to print I am told to define a printer.

I have the latest print drivers, I have installed the drivers frequently. For example if, if the printers all disappear and I install the HP M1120 MFP, it and everything else reappears.

What is going on? I have done some research on the web and Microsoft and the problem seems to be fairly common, but there does not seem to be any solution.

Any ideas?