Lost networking capability?

I am not sure when I lost my connectivity to my primary computer (PC) but it was from the time I installed Leopard to the time I started using Time Machine.
I have a PC which is the primary computer hard wired to a router. My iMac is wirelessly connected to it. Previously, when I clicked on my Network on the Mac, I could see the PC and transfer files to the PC.
Now, I can see the Mac on the PC and transfer files to the Mac, but only in that direction. I have the Network icon showing on the Mac, but the PC is not showing up to allow me to open it to transfer files. Looking in System Preferences/Network, the Airport is green and Connected and the proper network is checked. The Internal Modem, Bluetooth, Ethernet, and Firewire are disabled. These were the same settings as when the Network worked properly, so nothing here has changed. Disabling the Firewall on the PC does not change anything. However, previously, even if the Firewall was a problem, something still showed up in the Mac Network.
Any suggestions?
Thanks

I had this issue many times before (usually after a power failure or my ISP disconnecting my service for maint. etc) and my Mac would no longer connect to my PC or the internet automatically.
Solution 1) for reconnecting to the internet: Power down the iMac completely, unplug all cables connected to it and wait 10 seconds. Plug in your mouse, keyboard and Ethernet cable. Turn power back on and wait for complete boot. Plug in remaining cables. Your Router light should indicate you are again connected to the router and internet. Test with your Browser.
Solution 2) Power down procedure should provide the same solution for networking, with the addition that you may need to power down your router as well.
When I first bought my Mac it would find my home Network without any help from me. After the first time I had a problem with my mac finding my network (due to power failure) It no longer found my PC automatically (running windows XP) and I now have to open the finder, select the "GO" menu and select "connect to server."
This brings up the dialogue box for you to enter "smb://192.168.." replacing the asterisk with the numbers you assigned specifically to your PC. Depending on your PC settings, you may or may not have to provide a user name and password to log onto the network.
unfortunately, my iMac has never automatically found my PC and logged onto it after a powerup, i.e. does not show in the finder network until I manually connect using the Go menu.

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