E5-572G - problem with wifi drivers on win7

Hello,
I've got a problem with wifi drivers on my acer E5-572G. I think, that producer predicted that win8 will be installed on this computer, and that's why there are only drivers for this OS on the CD.

Unfortunately, I want to use WIN7. I've already installed all drivers without any problems, despite wifi-drivers... The ones from added CD don't work. As I see, the net card is Qualcomm Atheros AR956x. So, I tried to install drivers from  www.atheros-drivers.com. Windows tells me about error 52 (drivers aren't digitally signed).

My question is: what can I do?! Well, it can't be impossible to use win7 and Internet on this laptop, huh?
Would be grateful for help.