Mac Min cannot see PC with either Airport Express on ethernet connections

I am trying to network a Mac Mini, G4 Power Book, a PC laptop and PC desktop so far I can get the Mini to see the G4 and PC laptop but not the PC desktop. I have an Airport express and all but the PC desktop work OK with it. The PC desktop can see the Airport, which I have called MitchBVI, but when I try and connect to it nothing happens. The wireless card in the PC is a Linksys WMP5G. I have not enabled security yet as I wanted to get the whole network operating first.
I have tried linking the Mini to the PC with an Ethernet cable and if I do that the PC can see the Mini but not the other way round.
The fact that the PC laptop and the Mini can see each other suggest to me I have the correct permissions set on the Mini. As the PC desktop can see the Airport Express I assume that the Linksys card is working OK. As the PC desktop can see the Mac when the Ethernet cable is connected it would seem whatever permissions are needed on the desktop are set correctly.
Any suggestions greatly appreciated.
Thanks
Mitch

Thanks I had found your site and changed the MSHOME and WORKGROUP to a diffferent name MITCH that is how I got it working in part. My Powerbook can see the Mac Mini and so can the PC. The former through a wireless connection the later by ethernet. I can ping the IP address of the PC from the mac mini but cannot make the connection.
For a while on the PC i actually had a wireless connection but could not access the net with it and it dropped out again. Maybe having an ethernet and wireless connection is the problemalthough with the wireless disabled that has not helped.
I had a spare Linksys card and tried replacing it but that did not help. As I said in my first post other PC laptop works fine.
Thanks

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