13'' Macbook pro, OSX 10.8.2, wifi problems

Dear all,
I have a 13'' macbook pro from november 2012 with osx 10.8.2 and I have wifi connection problems at my place.
I installed "network strengh" and I discovered that I have a low connection in my appartment. I have to be stick to my internet box to reach 70% of connection quality. In my living room, I have no more than 25% with is not enough to have a good connection (per example, a lot of disconnection on skype...).
I have a friend who has an older macbook and he has 60% of connection quality in my living room.
I tried all the channels on my box
I also downloaded the
Mac Wi-Fi Update 1.0
and my mac doesn't even want to launch it, it says that the software is not supported by my system...
Does anyone of you had the same problem or have any idea about how I could fix this problem?
Thanks in advance.
Jean

How are you connecting to the Internet wirelessly? Is it directly from a router or is it via Apple's Airport Express products? If from a router wirelessly, check the router settings to reset to your MBPro. If from any Airport products, then reset the product with your MBPro.

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Re: Can't connect wirelessly HP Photosmart C4780 to MacBook Pro OSX 10.8.2 Mountain Lion.
I finally figured it out! (Sorry that I'm replying to my own posts btw, but I want to post the solution for anybody else with the SigmaplusEOL1 problem). If you have the SigmaplusEOL1 as your SSID when you print the "Wireless Network Test Report", you do NOT need to return it (I know that's hassle for people). To fix the problem, follow these steps.
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Re: Can't connect wirelessly HP Photosmart C4780 to MacBook Pro OSX 10.8.2 Mountain Lion.
Thank you for your prompt response. This has been a totally frustrating experience. I’ve spent at least 8 hours trying to fix this. My HP problems and your initial steps were identical to mine. I am by no means a tech person and my computer tech knowledge is minimal. However I followed your steps to the best of my ability.
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Re: Can't connect wirelessly HP Photosmart C4780 to MacBook Pro OSX 10.8.2 Mountain Lion.
Unfortunately I am unable to offer any further advice as I only followed the instructions listed on the other page.
Finally, as to having WEP enabled, I don't know. Don't even know where to look. The best that I could determine is that my security is WPA/WPA2 Personal.
I'm truly sorry about all of this. Thank you for your time and patience. After reading all of this and you change your mind, I would understand.

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