Okay guys and finally i did it i'll talk about my missing driver which is ( NETWORK CONTROLLER ) i just pressed right click on it ( inside device manager ) then properties  , then you choose Details .. instead of Device description open and choose hardware lds  then simply copy the 2nd driver name and google it online , you'll find free download thro many web sites ... i just did this and simply wifi is working perfectly now .   :)
hi,  My problem started when i re installed windows 7 Ultimate, and everything worked perfectly including wire internet connection Only Wifi connection not working, i tried to download almost all the drivers in ma model support page and still not identified, i even called the customer service and they sent me link for the accurate driver and still not working. please help, any solution ...  thx in advance :)
N5110 Wireless NOT WORKING AFTER RE INSTALLING WINDOWS 7, I NEED THE ACCURATE 
WIRELESS DRIVER PLEASE