Force Wireless to 5GHz Band
-      Right-click the My Computer icon on the desktop (if available).
-	Click Properties.
-	Click Hardware.
-	Click Device Manager.
-	Click the + sign to expand the Network Adapters entry.
-	Right-click the wireless adapter and click Properties
-	 Click on advanced,under property go to Wireless mode andselect whether you 802.11a. Make a note of what the setting was so you can change it back if desired.