Hi Amogh,  Thanks for your advice. I deleted the profiles ( two identical found !) , also deleted all entries of all WiFi routers in the Win 7 Registry. This step did not resolve the issue.  However I found the reason for the connection trouble and the solution is as follows:  In the Wireless Router being connected to  (TP-LINK) , the Wireless Settings --> Channel was set to "AUTO" (which is automatically selecting 20MHz or 40MHz) .  In the Dell WLAN 1703 Device driver (Properties --> Advanced --> 802.11 n Bandwidth , the value was set to (ie the Atheros default is !!)  "20MHz".  Once I set the value to option "20MHz / 40MHz Auto" , the connection sprang to life. What a relief !!! The matter is now completely resolved. Thank you for all of you who contributed.  Best regards Dzsino.
Hi, on brand new 3521 laptop with Win7 Pro the WLAN connects to selected wireless router but fails to establish internet connection. WLan Driver 1703 was duly installed after the Chipset driver were installed , as recommended. Other mobile devices happily connect to same router. Ubuntu on this laptop was also happy to connect to internet on WLAN, only Win7 fails. Turned off Win7 firewall , but no change. Shows unidentified connection in Network and Sharing Center.   Router SSID etc were correctly entered. Deleted WLAN profile and reentered , no change. Tried to connect to another wireless router with same result. I can only run this laptop on wired connection to the router.  I am at a loss as to what other steps I could take to fix this WLan / internet connection. Any suggestions would be welcome. Cheers.
WLAN connects to router but no internet connection on 15R 3521