Hi

I presume you are in 32bit mode, it may have been mentioned before. If you are using an onboard LPT socket then you will need to go into onto the BIOS to set the mode to EPP/ECP. If you are using a PCI card then you must have a 5v one, the 3.3v ones will not work reliably, if at all.
There is no mode setting needed on a PCI ports card.

Rob-T