Help Needed

[Guest Chaser81]

I recently switched broadband providers from PlusNet to Orange (because its free with my mobile phone). Previously I was using a linksys wireless router with my Plusnet connection, and yesterday I installed the Orange wireless router. I can get my Iphone and my laptop (running on Ubuntu) to connect to the wireless without any problems at all, and my desktop (Vista) will connect and work most of the time, though occasionally it will completely lose wireless reception completely and will not pick up any wireless networks at all, requiring a reboot to fix. The main problem however is my other laptop, which is running on XP (Service Pack 3). This just completely refuses to connect to the Orange router. This laptop doesnt have built in wireless, and instead connects through a linksys WPC54G wireless PCMCIA card. Every time I try and get it to connect, no matter what I do, it just continuously tries (and fails) to connect over and over again. I have tried uninstalling the WPC54G completely and reinstalling it, to no avail. I have looked into the problem and I am wondering if it has something to do with the security that the Orange router uses (by default WPA2). My previous router only used WEP and I never had a problem with it on any of my devices, all of a sudden along comes the WPA2 Orange router and I am having issues. Anyone had similar problems with XP (and for that matter Vista), and have they managed to resolve it?