Here are some steps by which i solved my and my colleges problem.
Go to the computer manufacture website
Download wireless driver for windows 7(32/64) depends on your OS
Right click on the file and got to properties
Then go to compatibility tab and select Windows Vista Services Pack 2 and apply
Then run the program as Administrator
After installation restart your PC and ENJOY :)
Thanks for the helpful post. Just to clarify, you're using the Windows 7 driver even though your computer is running 8.1, correct?