Macbook Pro can no longer connect to any wirless connection

My macbook pro has never had any problem connecting to a wireless connection up until recently. For the last two months, I have not been able to connect to any wireless signal although I can when connected directly to the router with a lan cable. these are all networks that I have used in the past, with all correct passwords or even to networks that are not password locked. do you have any ideas on what i can do about this before making the trip to the apple store?

i forgot to mention, its not even a matter of getting connected to the wireless signal with a few bars showing and not function, it just does not connect at all anymore and i get an error message saying:
"there was an error joining the network [the name of the network i am trying to connect to]"

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R a i n b o w 7000I work on behalf of HP
Click the “Kudos Thumbs Up" at the bottom of this post to say
“Thanks” for helping!
Click “Accept as Solution” if you feel my post solved your issue, it will help others find the solution!

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Macbook Pro can no longer connect to any wirless connection

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