Can I undo a security update?

I have lost my wireless connection after the latest update.
The Windose machine still works it is just my MacBook that has stopped.

I have lost my wireless connection after the latest
update.
The Windose machine still works it is just my MacBook
that has stopped.
Same problem. Airport ok on the iMac (no airport extreme update since not intel processor inside) but airport on macbook pro can not see the wireless network created by D-Link router. I do not think the security update created the problem, but more the aiport extreme update. However changing wep encryption does not seem tho repair the problem. Someone else has a suggestion?

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