What version of Windows 7 OS do you have on your Acer computer? is it 64 Bit? The only drivers available for this computer are Windows 7 64Bit not 32bit (x86)
Go to Start/Search and type
devmgmt.msc Right click the
devmgmt icon in the search results and
Run As Administrator. In the
Elevated Device Manager art there any devices with yellow flags? These devices need to have drivers installed. The last 2 drivers in the
Acer Driver download page for your model are the WiFi drivers for this computer.