Finally it worked. Many thanks to Saurabh A's reply in this  [URL] thread. My driver is 'Intel Centrino Wireless-N1030' (I didn't know) and the suitable driver for Windows 7 32bit is 'R311896.exe'. And I do not know where I found this driver. But it isn't in the list of [URL]  Anyway dell sucks. Users have to have a better knowledge about Hardware, Basic Internet, Hardware architectures, what is 32bit?, 32 or 64?...etc to deal with dell. But HP gives a complete drivers pack when you insert your product and model. HP provides a unique set of HWs for a particular model. if HP ABC XXYY -> unique set of hardwares but DELL ABC XXYY -> "we don't know what the exact hardware is, it could be one of the followings" Dell sucks again. First and last dell of mine.  
Hi, I cannot enable wifi in my laptop. When I press Fn+F2 a notification icon appear on the screen that enabled wireless, but it only appears Bluetooth adapter only. I tried couple of network drivers from [URL] , but doesn't work. I installed Speccy tool. It says 'wifi not enabled'. In my HP laptop (5 year old, not a single repair yet), there is a broadcom driver in the Device Manager, but I cannot see anything related to wifi with dell. Also there is an unidentified driver called 'Network Controller'. Can anyone tell me which is the suitable driver? I'm using Windows 7 32 bit SP1. And I upgraded BIOS version to A11 and there is no such an option to enable wifi from BIOS. Any help is appreciated. Thanks,  
Dell inspiron n5110 Core i5 wifi is not enabled