Wifi no longer works after update mountain lion

Ls,
I've updated my MacBook Pro to Mountian Lion yesterday.
Ever since the update I've lost the ability to use the internet over Wifi.
The system shows a check mark on the left of my network list, however there is no outside connection.
I have ran the assistant (assist me...) to trouble solve. My modem has been reset.
My iPad, iPod and Apple TV can all connect without a hitch. leaving me no choice but to ask my question here.
I was hoping that this problem had been posted previously so I would not have to expose my nowbness
Looking forward to an answer!
Kind regards,
Reese

I Read this sollution elsewhere on these forums and found that this worked for me.
However, the "load" time in Safari is not as fast as it used to be. Might be due to some router setting.
Solution:
For all the Dutch users that have a KPN Experiabox router:
1) go to http://192.168.2.254
2) Username: KPN Password: leave empty (You might have changed this yourself)
3) Go to Network (at the top)
4) Go to WLAN (at the left)
5) Set as follows:
Enable WLAN: Enable
Mode: IEEE 802.11g Only
Channel: 7
Transmitting power: 100%
Enable WMM QoS: Disable
This fixed my wifi problems. Good luck

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