Thank you for contacting the Intel Communities.
While using OEM systems like yours, the recommendation is to download and install the drivers from your computer's manufacturer website.
This is to avoid loosing any special features or settings while using the generic drivers from Intel.
Here you can find the drivers for your unit: Laptops :: Lenovo Z Series laptops :: Z51-70 Laptop (Lenovo) - Lenovo Support (US)
The Component to be selected would be "Display and Video Graphics".
The second option would be the generic drivers from Intel.
Here you can find the driver download page: Download Intel® Graphics Driver for Windows® 7/8.1/10* [15.40]
The third option would be to get the default drivers from Windows 10*.
You can get them by following these steps:
-Access the device manager.
-Look for display adapters.
-Right click and properties.
-"Driver" tab and hit uninstall.
If you require any further information or support, feel free to contact us back.