Can't connect to workgroup

Q, I have an intermitant problem here.I have 4pc's networked 1 running with xp pro,2 of them running with xp home and the last running with 2000 server.They are connected via 3 com cable router/acess point using DHCP to allocate IPaddress.Every thing has been working fine but recently i'm having problems viewing the workgroup i can acess all the pc's work\ping them can use internet on all of them.How ever if i try to view the workgroup to connect to a pc i can't acess it.All i get is workgroup's not acessable,you might not have permission etc.The network path was not found.I can also send folders through this i know the network is connected.Another strange thing is that if i use 'net view' it gives me a system error,network path not found.I've tried rebooting the router and using the network wizard and also checking the settings/firewalls etc but nothing helps.

A, I notice you are not as yet on a domain's and are operating in a peer to peer environment if it was a domain, the first you would check is your WINS.since you are operating in a peer to peer network it's impossible for you to find out the server in this environment as there is no client and no server it not possible to view the work group the best thing to do is enable the netbios over TCP/ip.Make sure that microsoft client for networks is enabled on the local computers.