I think I found a solution.
go to 1. Start / System Control / Network & Internet / Intel PRO Set Wireless Tools
2. open the "Intel Wifi Hotspot Assistant" - Settings
3. disable / un-tick both check boxes (connect automatically with Free Wifi Hotspots ; activate Intel Wifi Hotspot Assistant)
Steps 1-3 will turn "enable active probe" to value 1 in the registry after a re-boot
Thereafter 4. uninstall all network devices (LAN ; Wifi ; 3G etc.) in the device manager, but don't delete the drivers!!
5. re-boot your computer. Devices will be installed automatically from Windows
6. BINGO, you made it
Hopefully it works for you. For my Lenovo T430 it worked!