How can I get my laptop to recognize my PC through my router?

Okay, I've stayed up too long trying to figure this out on my own.  I have a Toshiba 1805-S253 laptop computer and a Micron Intel III Desktop PC.  On the Toshiba I have running Windows 2000 and on the Micron I have Windows XP Professional.  I bought a router LINKSYS Wireless-G Model No. WRT54G.  I installed the router setup fine on both computers and they're both connected through my router to my Comcast cable modem.  The internet is working fine on both of them but when it comes to sharing and networking files between the two it's only working from the PC to the laptop.  The PC is recognizing the laptop and can grab files from it when I do the run: \\jackson1\c$, but the laptop is not recognizing the PC.  When I go into network places and computers near me there's no other computers there and when I run: \\arlyss\c$ it says network ID not available.  I tried swapping all the cords, reinstalling the setup software, and made sure that I was sharing everything from the PC but the laptop still can find PC for whatever reason and I really need the files off the PC.  Any ideas?