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On this case the recommendation will be to contact Microsoft* for further assistance with the NET Framework software and see if they have a patch or an update that might solve this problem.
Another recommendation will be to back up all your information and reinstall the operating system, then install the latest driver for this adapter.
I have installed Windows (Windows 7 Ultimate x64 on my Toshiba Satellite) again with all updates from Microsoft Update (NET Framework Client Profile 4.0.30319 with latest updates). The NET Framework 4.0 Client Profile is the only version offered by Microsoft Update.
The first attempt of the installation of PROSet Wireless 15.1.0 was unsuccessful, the installer gave the same message of the lack of NET Framework 4.0.
The problem was resolved by the installation of full version of NET Framework 4.0 (Client Profile + Extended). After that installation there was the need of the update of NET Framework 4.0 from Microsoft Update (updates had been downloaded earlier for NET Framework 4.0 client version). And then the installation of PROSet Wireless 15.1.0 was successful.
But there is still the unresolved problem with a blank icon without a name in Statr Menu -> Control Panel menu which exist since PROSet Wireless 14.0. But this is probably the different problem (which does not exist on Vista x64).