Old Avaya usb wireless adapter won't connect?

I agree. Your adapter could use WEP for security, but your signal (from a router?) is secured using WPA. Also, is your network secured using MAC address filtering? I use it to stop unauthorised access to my wifi. You need to provide more information to get better answers I'm afraid.
A quick google check indicates the card may be one used in a laptop? Is this the case?

Tony H
October 2012

It difficult to give a specific answer bcause you don't say what the adapter is nor any information about the network that you are trying to connect to.

However I'd start by looking at the encryption. If it is very old it may not support the encryption in use on the network.

T
October 2012