|Do you know the make and model of the router you haver been given?|
Also make etc. of your (XP?) computer; and make/model of your wifi adapter?
This extract from Netgear explains your situation:
Not all wireless adapters support WPA and WPA2. Furthermore, client software is required on the client. Windows XP and Windows 2000 with Service Pack 3 do include the client software that supports WPA and WPA2. Nevertheless, the wireless adapter hardware and driver must also support WPA and WPA2. Consult the product document for your wireless adapter and WPA and WPA2 client software for instructions on configuring WPA and WPA2 settings.
Is your wifi adapter built-in; and have you checked to see if there are any updates for its driver?
Also does your system "see" the new router; even if you can't connect to it? If so then have you checked the settings for wifi access in the router's wifi security section - as in are there any restrictions related to the mac addresses of computer seeking to connect (i.e. is mac filtering active)?
message edited by trvlr