MBP Early 2011 Wi-fi Constantly showing "connection timeout" when attempting to connect to home wireless.

Whenever I try connection my home wireless (by selecting it from the dropdown list and attempting to type in the password),
I get an error like this:
Otherwise, I tried manually creating a network profile for it and when i try connecting, it gives me this:
Can anyone guide me on possible ways to rectify this problem? I have tried reformatting my MBP, restarting the router, etc etc.
My windows OS (which is on the same MBP) can connect to the network just fine.
Can anyone provide tips / help on how to rectify this issue?

Hi there ChengweiKe,
You may find the troubleshooting steps in the article below helpful.
Wi-Fi: How to troubleshoot Wi-Fi connectivity
http://support.apple.com/kb/HT4628
-Griff W. 

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