I am no expert on the running of x-plane.
You haven't indicated whether you have the boxed set of discs or a digital download version. I presume you are using a PC instead of a laptop with win7.
I run win7 on a PC and have just tried X-plane with the internet disabled. It works. I have the boxed discs and use, as a permanent connection in a vacant USB slot, is the USB key found at http://www.x-plane.com/store/desktop/x-plane_10_home-use_usb_key/ This may solve your problem.
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