Pamela's Laptop.
PamNet wireless network is working (tested with other stations), except this laptop. Connection attempt produced error: Windows cannot connect to PamNet. Wireless association failed because Windows did not receive any response from the wireless router or access point.
I had always thought it's the laptop (presence of IPV6, etc.) or bad channel. But turns out after the WBR1310 Ver.B1 D-Link router has upgraded its firmware from version 2.00 to 2.02, connection established succesfully.