win 7 b7100 Ad Hoc problem with iphone

my I phone have no any problem to connect to any windows and already no problem with windows 7 build 7000
but now when I create Access point by using windows 7 build 7100 ...the iphone see it and connect to it but when you look to the windows nothing connected .... then the iphone not connected really to windows

I my laptop is sony vaio VGN-Z12MN

and my friend laptop have windows 7 build 7100 and my phone connect to his laptop no problem

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