I am having the same problem with two desktops and a laptop. The Vista PC can see and access files on the two XP PCs, but the XP PCs cannot see shared files on the Vista PC. All PCs have Internet access via a wireless router. The Vista PC is new and previously all three XP machines networked without a hitch. Have verified that all PCs have same work group name. XP PCs also crash explorer when attempting to access Vista PC via My Network Places....