Airport Express Internet access

[FLW]

Hi, I'm a beginner at this stuff and just follow the basic updates Apple supply.
I have recently installed the latest Security update from Apple and since then my Airport express does not connect automatically to the Internet. I have to go in an select the airport network and type in my password each time I have turned on the Mac again.
Alos cannot access the Music store as I get a "keychain" error, even though I have been in and used keychain first aid repair and verify, as directed by yje message box.

Are these connected?

Any ideas?

Thks