Can't find other computers on network

Hi. Every once in a while (aka, 1/4 times) I can't see any other computers on my network. I am using a MacBook (with Tiger, of course), my brother has a a G5 iMac with Panther, there's an XP PC, and a win98 PC on the network. I access the network wirelessly and everyone else is wired to the router.
What happens is I that I go to the network tab in finder and wait but no computers show up, not even the other mac. I restart and that usually fixes it. The problem happens at totally random times.
The problem also occurs on the iMac, with the same behaviour.
Any ideas about what is happening?
-Eric

I don't think that's it. Remember, it also happens to the iMac -- and it's wired to the router. When it happens the iMac isn't even able to see the other PC's, which are also wired.
This problem also occured before I got the MacBook -- it happened on the iMac. And at that time we only had a wired router. So, I was trying to access a PC with XP over a wired router with the iMac and it still happened. So, I'm guessing it's a problem with OSX (and not just Tiger because the iMac has Panther).
Oh and by the way, we currently use a wireless-g router by Trendnet (model number TEW-432BRP). It has 4 wired ports for ethernet cables and an antenna for wireless.
-Eric

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