Recently I upgreaded my Aspire 5920G to Windows 8.1 from Windows 8 which was all working fine. As soon as I did this the network card would no longer start. I searched information on Inte'l's site and discovered that they are not supporting the particular network adapter for Windows 8.1 nor does it appear does ACER or Microsoft. Pity that Microsoft doesn't give any warning of this issue ahead of you upgrading even if you use their compatibility wizard prior to upgrading.
Once it happened I frantically turned to Dr Google to find a solution and the best I could come up with was some forum about their being a confilict with the Richo Card Reader driver and that if you updated the driver of this and then reinstalled the network adapter then it would all work. I keenly followed this plan but to no avail. However if I disable the card-reader then my network adapter works. So this seems obvious to me that there is a conflict between the two drivers.
Is there a way of solving the conflict - I'm not a computer genius but can follow step by step instructions!