Can't see Win PCs on basic network

Hey, I have a Mac Pro hexacore running OS X 10.6.8 and I can see my other mac pro but not my 4 windows computers.  I can ping them by IP address just fine and I can even map a network drive to one of them by IP address but they do not show up.  The Win 7 and Vista are set for Network discovery but still do not show up.  For reasons known only to Apple the Mac is seeing non-existent networks as if they are networks and of course nothing is on these networks but they did exist months ago.  All computers are on the same subnet.  I have tried getting the mac to be a part of the same workgroup name but apparently it is not seeing the other network and so it just duplicates the workgroup name in its own little world.
Ideas would be wonderful.  I am not exactly a novice - I am an MCSE (from several years ago - but still an MCSE) and I have been working with Macs since the Mac Plus.  I just can't seem to break the code as to how to make the computers see each other.
Oh, no problme on accessing the internet on any computer.  We have AT&T UVERSE and that part seems ot be OK.  All computers are connected with of course cat 5 and using a large 24 port swithched gig ethernet hub.
Thanks

No, the PCs do not have anyhing on them.  I am thinking it has something to do with the network setup.  I am working on trying to chase down a setup issue on the network.  It is one of those things where the way it is set up should work but doesn't.  We have the wireless router on one submnet and the wired machines on the other subnet - 192.168.2.0 and 192.168.1.0.  the PCs see each other on the wired network but the macs on the same wired network do not see the pcs but when I turn all the macs on wireless they all sync up just fine and see each other.  You would think that if the IP addresses are only 5 or 6 numbers apart and are given out by the same DHCP with the same subnet mask and gateway that they would think they are on the same subnet - but for reasons only know to Apple - they do not see each other.  I can directly map a netword drive in either direction but the computer networks do not see each other at all.  Crazy???

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