My MBP 2010 suddenly can't find my wifi anymore

Since last monday my MBP 2010 suddenly couldn't find my wifi-network anymore. My older MB (2007) has no problems at all. Tried rebooting modem, rebooting MBP. problem seemed to be solved, but next day, the trouble started all over again. Any suggestions? Modem is Speedtouch.
Thanks

First make sure your Mac's Airport is turned on to do this click the WiFi symbol in your menubar. In the menu that appears the first line should say " Airport: On" if it says off click "Turn Airport on" which will be directly below.
Alternatively try removing your WiFi network from your Macs list of known networks. I'll show you how to do that below:
In System Preferences select "Network". In the pane on the left hand side make sure Airport is selected. On the right select "advanced". In the window that appears click the name of your WiFi network. Below that click the "-" and your network will be "forgotten". Reboot. Your wifi network should now be visible to your Mac. Just be sure you know your WiFi password.

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~~~~~~~~~~~~~~~~~~~~~~~~~
iOS 6 Wifi Problems/Fixes
Fix For iOS 6 WiFi Problems?
http://tabletcrunch.com/2012/09/27/fix-ios-6-wifi-problems/
Did iOS 6 Screw Your Wi-Fi? Here’s How to Fix It
http://gizmodo.com/5944761/does-ios-6-have-a-wi+fi-bug
How To Fix Wi-Fi Connectivity Issue After Upgrading To iOS 6
http://www.iphonehacks.com/2012/09/fix-wi-fi-connectivity-issue-after-upgrading- to-ios-6.html
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http://www.youtube.com/watch?v=XsWS4ha-dn0
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~~~~~~~~~~~~~~~~~~~~~~~
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http://ipad.about.com/od/iPad_Troubleshooting/ss/How-To-Fix-My-Ipad-Wont-Connect -To-Wi-Fi.htm
iOS: Connecting to the Internet http://support.apple.com/kb/HT1695
iOS: Recommended settings for Wi-Fi routers and access points http://support.apple.com/kb/HT4199
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http://osxdaily.com/2012/03/21/fix-new-ipad-3-wi-fi-reception-problems/
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http://appletoolbox.com/2010/04/ipad-wi-fi-problems-comprehensive-list-of-fixes/
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My MBP 2010 suddenly can't find my wifi anymore

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