Internet but no network

[ChaosTheory]

I have a small network that consists of 3 wired computers, 2 wired network printers, and one wireless computer. They are all connected to a D-link switch that is hooked to a Belkin Wireless N+ router hooked to a DSL modem. That connection is recent as the previous router gave out, and before that everything worked.

My problem is this, all computers have internet connection, most computers can access files on other computers that have a shortcut (i.e. COMP-A has a shortcut to a folder on COMP-B that it can access fine, and COMP-B can access the Quickbooks company file on COMP-C), and I can print to the network printers, however, under network, most of the computers on the network are not detected, sometimes even the computer itself doesn't show (i.e. on COMP-A under network COMP-A doesn't show up). Also, I can't seem to connect to the wireless computer (COMP-D), even through a shortcut (i.e. UPS Worldship on COMP-A can't access the main file on COMP-D)

As I said before, everything was working fine until I had to switch out my routers (I did have a Linksys Wireless G+ setup as a switch hooked to a Linksys Wireless N that connected to the modem, and computers were hooked into both), so I am guessing somewhere I have a setting messed up.

Any help is appreciated, all computers are running vista, and I can successfully ping all computers except the COMP-D (wireless), which when I try i get a Destination host unreachable error, with NO data loss. Up until I started writing this COMP-D couldn't access the network, but I went to check something a moment ago and now all the sudden I can pull up the shared folder shortcut and print. Also, under DHCP client list on the Belkin router, all the wired computers show up, but the wireless does not.

Thanks!

[johnwill]

What is the exact make/model of the modem and the router. Also, exactly how are they wired together?