I am in the same boat; Wireless was working fine, then I changed a Remote setting (that I can't recall), now I am experiencing the same as the OP!
I use WPA2/AES w/strict password. Have enabled SSID (normally hidden).
--I can see my WAP, but it makes me type the password manually each time. Tabs are missing for the connection that were there previously.
--The Add Manually option DOES NOT WORK! Will not even work for WEP/Open at Starbucks (just tried). Can connect at SBs, but can't add as a Preferred Network.
--After doing Add, I get the message ACCESS DENIED. This happened at Starbucks w/WEP just like at home. Can't see any Preferred Networks.
--ZERO CONFIG IS JUST GONE! Have tried everything I can find on this forum, nothing works.
--Any way I can reinstall all default Services that should be running?
--A list anywhere I can look at to compare what else is missing to make WZC disappear?
***Another note, this is a Dell Wireless 1397 WLAN Mini-Card, and an MS Virtual Wifi Miniport Adapter. I have unistalled the Dell adapter, but it then removes the MS one with it.