Hello. I got a brand new Acer Aspire E5-521-39BA. It came with a Windows 8.1, which I tried to downgrade to Windows 7. After doing that, I noticed that my wireless wasn't working anymore. Now, even after I reinstalled Windows 8.1, I see the same error when I try to install the Wireless driver: "The Device may not be present or could have been ejected/unplugged from the system" Can anyone help me with that? Thank you!