Macbook pro no longer detects wifi devices on my network...

I have a macbook pro 2.53 i5 with Software Mac OS X Lion 10.7.3
it was detecting other devices like my PC, my tablet etc now in finder but now I can't get the laptop to find any devices... my PC is working fine and detects all of my devices....but the macbook can't detect anything ... is there a setting I need to change or could there be something else wrong? help!
thanks

Try Reset SMC. http://support.apple.com/kb/HT3964

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Try Reset SMC. http://support.apple.com/kb/HT3964

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I considered the network hog point, but I don't believe that I was using any excessive amounts of bandwidth. Also, because I can no longer detect any networks at the Starbucks location (not just the Starbucks network) I don't believe that this is the problem. Also, when I updated the operating system I was sure to disconnect from wifi first, I had already downloaded the update on my home network, just had yet to restart to install it, so my security shouldn't have been an issue either. How exactly can I go about masking my MAC address so I could double check to see if it was the network issue?
Oh, also, I booted into Windows 7 via boot camp and for some reason Windows is also unable to detect any networks while at Starbucks as well, which is even more confusing. I don't know if it's worth mentioning, but I bought this MacBook pro retina in Canada and am now in There UK for school. I've heard that north American macs don't play well with one of the network channels that is commonly used over here, so that also may play a role in all of this. But considering that I was able to consistently use their wifi for a couple weeks with no issue, I don't see how that could be the problem. As far as WEP encrypted goes, the network is unsecured so I don't believe that's the problem.
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i just bought late 2011 macbook pro on 27 april this year...it was succesfully connect to any wifi at anytime & anywhere...
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Macbook pro no longer detects wifi devices on my network...

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