Shared Printer Problem

I am having a problem printing on a home network. The printer is connected by USB to a desktop and is also installed as a shared printer on a laptop. The network is set up and running properly - the laptop can connect to the internet via the desktop and file sharing between the two PCs operates normally. The printer can be seen on both PCs - on the desktop it is set up to share while on the laptop it shows as a shared printer (with the icon underlined in yellow). When I send a print job from the laptop it appears in the print queue on the desktop with status as printing but the job never prints. I have installed and reinstalled the printer on both machines, installed a new driver and tried setting the printer to printing direct rather than spooling but all to no avail. Can anyone help please? OS is Windows XP Home SP2 and the printer is an Epson inkjet Stylus Color D68.