Please uninstall the wireless driver completely. Once you do this, download the file Wireless_Win8.1_64_17.14.0.exe and install it:
If possible delete the profile from wireless Networks and try connecting again to the Wireless Lan.
thank you for taking time to help me.
The file you're pointing to is the one i did install when i installed my NUC. It comes with Intel NUC driver package. I did not installed the drivers from the DVD. For the first install of my NUC, i downloaded the latest drivers from intel website and also this 8.1_64_17.14.0 release for wifi.