You will not want to delete the Farm Works Software files from the Add and Remove Programs.
As far as your printer error try these steps:
Make sure Farm Works is closed and any other running programs. Select Start and then Control Panel. In the Control Panel should be a Printers icon, select that. There will be an option to add a printer. Add Printer Wizard will display Select to Add a local Printer Use existing Port: LPT1 (Printer Port)- choose that then select next Under Manufacturer