Print out the configuration page on your printer to see what its IP is and go into the computer -> control panel -> printers -> right click the printer -> select properties -> switch to the ports tab -> see if the IP addresses match. If not edit the port and put in the new IP address.
Might want to call the printer's tech support to get help doing this.
Reinstall the disk that came with the printer. It wil automatically discover the new IP for your printer and update the port.