Unable to Connect Windows 7 machine to the Accesspoint. Windows XP machine working good

I have Cisco 1140 AP which I have configured as WPA2-AES encryption.To get maximum throughtput I shutdown 2.4 GHz interface and transmitting signal only on 5 GHz and channel width is 40 MHz.I am not broadcasting SSID
Now when I connect two windows XP machines to wireless they are working good and getting 300 Mbps throughtput.Now I configured another three WIndows 7 machine( I am sure that I did correct conffiguration in windows 7 machine and I choose "connect even if network not broadcasting")
But after configuration I am not able to see my wireless network and it is not connecting itself. Any suggestion please ?
Thank you,
Nilay

It is autonomous AP. My Win 7 laptop is 802.11n capable but it connects to AP only when I turn 2.4 GHz int on..
Sent from Cisco Technical Support iPhone App

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