You didn't mention the laptop's wireless device. It needs to be WPA capable as well. Upgrade to SP3 ASAP. Make sure your laptop's wireless device has the latest driver as well. If the device came with some wireless management service, turn that off and use Windows wireless zero service instead. In any event, the device needs to be capable above WEP or you'll have to replace it to get reasonable security.
I have been using D-Link's router model # DI-524UP in wired mode for my laptop. Now, I want to use a second laptop to connect to the router in wireless mode.
The second laptop's current OS/security setup is as below :-
a) Win-XP SP2 (completely patched, vetted by Secunia)
b) AVG AV/AS free 9.0
c) ZA firewall free 7.0.483
d) Sundry utilities/protection software : Ccleaner, Spywareblaster
e) Safe browsing habit
Yes, I shall be upgrading the OS to XP-SP3 within the next three months.
Since I do not understand the wireless security aspects, I had requested a friend, more knowledgeable than me, to do the wireless setup. He tried to setup the router for WPA, but could not due to unknown reasons, so settled with "open system - WEP enabled".
Please advise how to make the second laptop work in WPA mode.