Network Woes (Perhaps a bad card?)

I've been having issues with my WRT54GL since I've bought it. I don't know if its my incompetence, my roommates, the routers, or our wireless access card.

The card isa 802.11g Linksys card. I used it last year and it was decent I suppose. It got the job done. I wouldnt know what a good or bad card would be, unless of course its the reason we are having problems now.

I've tried setting up a WPA secured network, a WEP secured network, Ive tried filtering access by only allowing certain MAC addresses... I have no clue what's up.

It seems like every time I secure my network, he cannot connect. I've tried fiddling around with it, I cant for the life of me figure it out.

I dont wanna run to the store and pick up a card just yet. He can connect just fine when I dont have any security measures up. I'm in an apartment, and if I dont have a secured network up, Im guaranteed to have at least 3 people stealing my bandwidth =(

Guys Im at my wits end with this one. I really truly need help.


edit: I realize now that this is more of a network discussion than a hardware discussion. Im pretty sure its NOT the wireless card but I have no idea if I can lock/delete topics. Sigh...

Turn off all security and just see if you can connect and use the network.
If you can turn on the security you want (WPA) and don't forget to setup the same pass phrase on your client (PC). Test again. If it doesn't work with security try clearing the cache on your web browser.

Regards

Fred