My Mac won't recognize my printer..?

I have a lexmark impact s305 that i was told is compatible with a Mac. It is already set up and working on 3 PC's so the printer is not the problem. I downloaded the driver online and when i went to System preferences-> Printers&Fax and clicked the plus button to install it there no printers show up at all under default. How do I solve this problem...apple wants to charge me $50 for a phone call and the nearest apple store is an hour away and who knows what they will charge me. Any help on this situation would be appreciated.