1. Download the driver from this web site: Intel Wireless LAN (11abgn, 11bgn, 11ac) for Windows 8 (32-bit, 64-bit), 7 (32-bit, 64-bit) - ThinkPad - Lenovo Support …
2. Uninstall (remove) old Intel LAN drivers
3. Instal the drivers package BUT in last window uncheck "Instal Intel Wireless LAN now" an click Finish.
4. Go to Computer -> System properties -> Device manager and click the right mouse button on LAN device. Than click update the driver -> Browse my computer... -> search the drivers folder that you installed in 3 and Update the driver.
Everything seems to be OK so far in my case.