MAC Network Printing

Networking your MAC with you shared PC printer requires a password for you MAC and a MAC driver for the printer.

Recover a lost MAC login and password: If you do not remember you MAC password then you need to recover it:   I forgot my password on macbook pro: Apple Support

Install the driver for the printer.  Write down the manufacturer and model.  Browse to their website and download the driver. (look for downloads and/or support)

Share the printer.  Here are 2 links.  Skim both and see which is easier for you to follow.  Mac 101: Printing (OS X Lion)     Sharing a Printer, Even on a PC-Mac Home Network