Printer problem on Linksys WRT54G2

Hello,
My sister and I have Dell laptops that are connected to Linksys WRT54G2 routers. I at the beginning had no problem printing on the Epson printer. Now I can't print anything. My sister was having problems printing directly. I have the sharing on and have plugged and unplugged everything over and over again. I don't know what to do. The desktop and the laptops are Windows Vista. Please Help!