Did you disable the SP2 Firewall, or you are running two Firewalls?
Successful Sharing involves some general consideration in Network settings,
As well as specific adjustment of each computer according to what is allowed
to be shared.
Jack (MVP-Networking).

"Tony V" wrote in message
>I have a D-Link wirless router (DI-624) that I use to allow all 5 computers
> in the house to share an Internet connection.
> Yesterday I ran the Microsoft Home Network Wizard successfully on all 5
> computer (starting with the one that is directly cabled to the the router)
> because I want to share files and printers.
> However, only 3 of the 5 computers can see each other (when I attempt to
> "Map a Drive" in Explorer). If I try to ping the two computers that I
> cannot
> map to, I get the "REQUEST TIMED OUT" message from the ping command.
> Any suggestions to what I need to do to see these 2 computers on the
> network
> so that I can map to them??
> What am I missing? What's different about the two computers?
> Any help would be appreciated.
> All computers are running XP Home Sp2 and all have 3rd party anti-virus
> and
> firewall software which is current.
> Tony V