1. I have a Linksys DWL-G630 and it's the worst of all the cards we have at the office. If this is yours (you didn't tell!), the I'd exchange it for any other make/model.

2. " I used to be able to, but i think ever since i reinstalled my operating system, win xp pro, i can't access it anymore"

Installing an OS on a machine is not enough. You'll need motherboard, system drivers and more drivers before such PC-Cards will work. It's either a balky card or your OS install is incomplete.
Bob