Ethernet OK -- Wireless Connects to Web but Can't See Network

I installing a 2Wire 1701 HG gateway, which has ethernet ports, a USB port,
and wireless capability. We have desktop computers and JetDirect devices
connected via ethernet cables, and laptops that have both ethernet and
wireless capability.

I am now having problems with the first laptop (XP Pro, SP 2) that I am
installing on this network. No problems at all when using an ethernet
connection.
Wireless - Can Connect to Web but not Windows Network

But when using wireless interface (Linksys wpc54G notebook adapter), though
laptop can connect to the internet it cannot see any network computers or
devices, not even itself.

(Previously, on an earlier network configuration we'd had running, I had set
laptop's Control Panel / Administrative Options / Computer Browser to
"Manual", to successfully correct the problem this laptop had with not seeing
some of the other computers on the network.)

Not sure what to try next.