"Unable to find certificate" error

When I try to connect to my wireless connection, it tries to get an IP address but comes up with the error message "Unable to find certificate". I'm using a wireless adapter simply named: Wireless 11g USB Adapter, and it uses the ZDWLan drivers. I'm not sure if the drivers are the problem; i'm using the same ones as on another computer with the same adapter.

I've never had this problem before, and it's a brand new computer, so I have no idea what I can do to fix it. Any help?

Thanks in advance,

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