MacBook Air can't join Wi-Fi networks

My MacBook Air (2013 model, 1.3 Ghz Intel Core i5, 4GB 1600 MHz DDR3, OS X Version 10.9.2) which I received less than a week ago was working fine. Until last night. My latop will now not connect to ANY wifi networks. It's sees the networks but when I try to manually join one it says "The wifi network ... could not be joined" when I then run diagnostics it says "Wifi not associated" and "review wifi best practices". Not helpful. Can anyone please tell me how to fix it? If I can! I haven't found any issues similar to mine yet. So, hoping there's an easy fix.

The warranty entitles you to complimentary phone support for the first 90 days of ownership.
If you bought the product in the U.S. directly from Apple (not from a reseller), you have 14 days from the date of delivery in which to exchange or return it for a refund. In other countries, the return policy may be different. If you bought from a reseller, its return policy applies.

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