The driver should not matter as long as the laptop is not set with a static internal address - and make sure that your modem is working properly - Windows 8.1 by default will automatically connect to a properly configured Express by choosing the network and entering the password - if you have changed any settings different from factory settngs then change them back to the original - make sure that your Express is configured as follows:
Internet connection = PPOE - be sure to enter your logon info correctly
Wi-fi Mode = create a wireless network - connected via ethernet
Name your wireless network - use a simple name
Security = WPA2 Personal
Password = 8 characters of your choice - use letters or numbers only - no caps
Router Mode = DHCP and NAT
IPV6 = link local only
Leave eveything else as default
Once it is configured properly, unplug all devices or power them down and then power up starting with the Modem - be sure to remove and replace the battery if present -- wait for it to fully boot - then plug in the Express and wait for a green light - then turn on the laptop - then choose your wireless network and enter the password.
Let us know ow you made out