T400 Hangs Surfing or Working on WiFi Network and the Wifi Led stops Blinking !!!

I have a T400 Model (2764CTO) - with 5300 AGN, 2.53 Ghz, 3 Gigs RAM.
I have been facing a wiered problem - my machine hangs - all of a sudden - and at the times - after the machine has hung - the WiFi Led - goes off. I have searched and installed PC Doctor for Lenovo - and it does not capture the Hang Event. The only option I have left is a Hard Re-Boot.
Can any one please help. I have updated my LAN Drivers and WiFi Drivers - and still dun know what cud be causing this issue !!!

Hi drpiso,
Thanks for the question. Based on what you stated, it seems like the computer is the only device having trouble connecting only to your home network. I would recommend that you read this article, it may be able to help the issue.
iOS and OS X: Recommended settings for Wi-Fi routers and access points - Apple Support
Thanks for using Apple Support Communities.
Cheers,
Mario

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http://support.apple.com/kb/ts3281
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I got an error message: 'iTunes has stopped working. A problem caused the program to stop working correctly. The solution asked me to load latest version which I did many times and still not working... HELP!

[Window Title]
Microsoft Windows
[Main Instruction]
iTunes has stopped working
[Content]
A problem caused the program to stop working correctly. Windows will close the program and notify you if a solution is available.
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This is what I got... sorry, not very tech savvy to copy the error message onto here...
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