HP Printer freezes PC temporarily

I have just installed a new HP LaserJet 1320 for a customer using a Dell 1000R(1.0 Ghz P3, 512MB, W2K) and when he sends a document to print, windows locks up until the print operation has completed. The printer is shared on our LAN, from his PC, with one other user accessing it. Any thoughts or ideas would be greatly appreciated. =)