No experience with 3COM products, but... Are you using Windows XP on your computer? You can open Network properties, and for that network adapter you can check a box with a title lke "Use Windows to manage wireless connections" or something like that (have to check my laptop to be sure). Then you should be able to see a list of networks available.
If you don't have a wi-fi access point, then you might have to change the configuration on this adapter from infrastructure to peer-to-peer to share with other devices. Have a look around its Properties.
Sorry, forgot to mention what system I am using. yes I am on XP with SP1 installed. Will check the network connections but cannot remember seeing any of the boxes you are referring to. Am I missing a major component here or something?