In the responses there are a few suggestions for people that have got theirs to work.
Normally most controllers automatically install drivers, but it appears this one has compatibility issues with win 8.1.
One suggestion listed was to connect the controller (Uninstall any previously installed drivers) install the win7 drivers from here:
http://www.microsoft.com/hardware/en-gb/d/xbox-360-controller-for-windows
Then leave the controller connected as you restart the computer, apparently this worked for someone.