Can't see PC's on network, but can ping them, connect to server etc

Hi All
I'm experiencing something pretty bizarre.
I have a small network at my office. There are 3 PC's, and 2 Macs, one of them a Mac Mini running 10.6.5. All computers are set to the same workgroup. All the PCs can see all the Macs, no problem.
Yet my Mac Mini can (most of the time) only see the other Mac. (When I use Go > Network).
I can ping all the PC's from the Mac Mini. But they won't show up in the network view.
The annoying thing is sometimes I can see all the PC's (theres no pattern to it!) and I have connected to a printer on one of the PC's. With that particular PC, if I use 'Connect to Server' I get
'Select the volumes you want to mount on "packing-pc" but there are no volumes in the list.
Whats really bugging me is that sometimes all the pcs are there when I view the network, and sometimes they aren't.
ANyone got any ideas please? I'm pulling my hair out! I wanna ditch my PC at work but until I can print reliably (to the PC with the printer attached) I can't!
Thanks in anticipation!
Mark

I'm wondering if this is connected?
http://social.technet.microsoft.com/Forums/en/w7itpronetworking/thread/2c98eb8c- 8234-4060-b8a7-e484ca29df72

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