Small business network issues!!!

I am at my wits end with this problem:  We have a small business network consisting of 6 Mac Pro computers and 2 Windows PCs.  Everything was working fine until we needed to replace one of the WinXP machines with a Windows 7 machine.  None of the Macs can see the PCs unless they physically type in the IP address (they used to show up in the finder as the computer name).  None of the PCs can access the Macs at all and now shares on one of the Macs are no longer visible by the rest of the network.  Any help would be appreciated.
Computers:
Mac Pro 10.7.5
Mac Pro 10.6.8 (x4)
Mac Pro 10.5
Windows 7 64-bit Professional
Windows XP Professional
I have made sure that every computer uses the correct workgroup name and that all file sharing is enabled. 

I've seen it take 45 minuyes for a PC to announce it's name on the network, just sayin'.
Anyway, does the PCs IPs ever change?

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