HT4199 Mountain Lion OS can't find my Network

I recently installed Mountain Lion OS last night so I could have AirPlay for my new Apple TV.  Now my iMac can't find my WiFi network which worked fine before I downloaded the new OS.  How do I fix this? Ugh

I have rebooted both the computer and the router.  It won't show my Network after installation of Mountain Lion. Worked fine before on my old OS system.  The Mac guy told me to buy it and download after I bought my Apple TV this weekend so I can stream web content.  I don't know if my router to set up for a private network, how do I found that out?
Thanks!

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