13" 2.3 i5 wifi keeps timing out

My one month only Macbook Pro 13 has suddenly developed a problem with the wifi.  It keeps timing out or it finds the network but can not connect to the internet.  I have a dell and 2 other PC's and PS3 and all other machines can connect so I know its not the router.  Is there a wider problem with the macbook pro 13?  I really need to know how to resolve this ASAP?

I had a similar problem and I changed the channel on my router, and all seemed good from there, there might have been interference with other devices in the household.

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