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You didn't mention the exact Lenovo G50 you have. But went to Lenovo Support for Model G50-70 and the VGA Graphics version is the same one you mentioned on your original post.
Here is the latest AMD Laptop driver for the HD 8570M : AMD Radeon™ HD 8570M Series GPU Drivers & Support | AMD
Here is how to install AMD Display drivers on Laptop: Laptop graphics update...How to and how to configure your laptop: Configuring Laptop Switchable Graphics on a Windows® Based System | AMD
Note: You need to download DDU (Display Driver Uninstaller) and run it in Safe Mode with the Internet disconnected. Once you boot up still with the internet disconnected install the latest AMD Driver. This will prevent Windows from installing the older AMD Driver. Then reconnect the internet.