Acer 4745G has problem in Win10. ( i5-520M + HD 5650)
can't change intel graphics to HD 5650 or black screen.
you can disable intel graphic in BIOS if you upgrade to Win10.
First, make sure you have installed the chipset drivers for your laptop, by visiting the Acer support site.
Then, use the "clean" install method, but make sure that the chipset drivers are not uninstalled, if you use an AMD CPU. Or else you will have to reinstall them, before updating your gpu driver.
I assume that there is only one dedicated gpu card and no integrated, right ?