W/less network - missing laptop

[Sadruddin]

Hi. We run a wireless network, but at work have the same problem non-wireless.

I'm on 3 machines - tower(A) + 2 laps. All run XPPro, tower and one lap on sp1(B), one on sp2(C).

All can connect fine to internet via dsl - netgear wireless modem/router.

A(tower) sees shareable space on B, but can't see C.
B(lap) sees shareable space on A, but can't see C.
C(lap) sees bot the others.

As I say, this is the same at work, non wireless.
Any ideas?

S