Under Windows 7 you have to gather together the driver

The device is low contrast of the hardware OK, but still OK screen, keyboard layout unusual by some getting used to, but also OK, speed (with i3) OK, facilities good.
Very annoying is a faulty driver supply. Loads to the drivers from the Lenovo download page, 3 units remain unserved, Lenovo Energy Manager is missing. The WLAN is not up and running. The driver fails with directory error and I have not found a viable alternative. The Win8 driver will not run here.
Addendum:
My attempts here to get support from Lenovo, were unsuccessful. There is neither telephone nor email support for this driver problems. I had 3 units ordered, all have the same mistake, so it is not a hardware problem, but sloppy drivers for Windows 7 that have no service more, since now Windows 8 is currently. Too bad, the laptop would be useful, but is not to be used on Windows 7!
Addendum 2:
The tip of Dirk (see Comments) has solved the problem, power mangement and wireless drivers from the G500 function properly.