Installing a printer doesn´t work properly out of the box.
Why is a long, convoluted, and confusing story. Someone didn't do an integration test in Gnome-land when they set this up. Ubuntu w/Unity fixed this but Mint appears to be running Gnome3 directly and then modifying it.
Sorry for the rant.
Open up a Terminal and run the following command:
And for the WinXP printer use "Windows printer via Samba" ( I think that's the title of the option ). The rest of the options are discombobulated and don't work properly.