Dell AIO 962 Will not share on the network

I have a Dell 962 connected by LAN to a Gateway with Windows XP.  WHen I try to share the printer, it gives an error "Printer settings could not be saved.  Operation could not be completed."

I've checked to ensure the drivers are loaded and that the network allows sharing.

Other suggestions?

My network is wired from the Gateway to the Router and wireless from there to two other computers.   The printer connection and file sharing used to work.  Not sure what changed.