Mom calls, is having problems with printing. "It says 'Unknown printer error'." Drive down, verify that is what it is saying. We determine that she is trying to print to a printer that no longer exists. I show her how to pick a new printer from the Print dialog box, prints fine. To make sure it doesn't happen again, I open "Devices and Printers" and delete the old printer; it disappears from that window. I go to print again and the old printer reappears. I go back to "Devices and Printers" and, sure enough, Windows put the printer back. Delete again; poof. Close "Devices and Printers", open "Devices and Printers": it's there again.