WiFi won't work on Mountain Lion

Hello,
I installed Mountain Lion yesterday and all went ok until I noticed that my WiFi isn't working. WiFi seems to be connected to my MacBookPro, that's what indicates the sign in the upper right corner (full WiFi). If I start Safari, Mail, App Store and iTunes internet won't work. All worked fine with Lion. On other Apple devices and Windows computers in our house WiFi works perfectly.
Ethernet works.
Does anyone have any suggestions what to do?

If you are attempting to use a WiFi connection between the iMac and the Time Capsule, I would suggest the following as a possibility.  If you haven't already, on your "iMac" open your Applications folder>click on "Utilities">click on "Airport Utility">there you should see an icon with your Time Capsule showing, and there should be a Green light icon. Then click on the icon for the Time Capsule, which will bring up a box with an "Edit" button.  Click on "Edit" and there you will find the Basestation,Wireless, Network, etc. buttons.  Click on each, one at a time.  You should check that each of those is completed properly.  Then, go back to the "Applications" folder>System Preferences>Network>here Unlock the "Padlock" icon in the lower left corner of the window by clicking on it and entering your Passwword>turn "On" the WiFi lisitng in the column of networks above there.  Hopefully this all will resolve your issues.

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