IDSTECH 0 Newbie Poster

Setup:
1 XP - SP2 PC with Olivetti d-Copia 15KX connected to LPT1. Printer is shared. 2nd XP - SP2 PC has been set up to use the shared printer.

Problem:
Receiving intermittend error "The RPC server is not available" when printing.

Steps taken:
Re-installed printer on both machines
Installed latest available printer driver
Checked whether RPC & RPC locator services are running
Checked whether Print Spooler service is running

Any other ideas, anyone?