This worked for me and I am running Windows 7 on a Dell D810.   Go to Control Panel....Network and Sharing Center....Change Adapter Settings.    Then, right click on the wireles connection and click on Diagnose.   It seemed to turn the WiFi on for me...as I can't get my Function F2 combination to work either.   Hope it works for you guys too.
Hey everyone!   I have a kind of stupid problem. The keyboard of my Inspiron 6400 is broken. I "solved" that issue by just using an USB-Keyboard. Only problem is, that Wireless was deactivatet, and I simply can't find any option to activate it (using Windows 7).  Rightclick in the Netyworksfolder and "Deactivate"/"Activate" (that's what it's called in German, am not very sure about my translation) won't work, even reinstalling the driver leaves it deactivated, and Windows Problem Center also just tells me to activate it. When rightclicking on this Bluetooth sign in the Taskbar and chosing "Activate Bluetooth" i get a pop up telling me to use the Fn-Key....   There must be a way to do that! Thanks a lot, have a nice day! Ade
Activate Wifi/Bluetooth without Fn-Key