No Network

Hi,I need some help. Today I got a Dell Inspiron n5110 blue, with Intel Core i3 2350M 2.3GHz
I successfully installed original windows 7 professional,but I don't have the ability to connect to any network.
At home we do have wireless,a working router that other laptops connect to without a problem,but this one can't find any network.
Also,in the control panel menu,under network and sharing, among wireless adapters there is only a bluetooth adapter listed,no LAN connection or anything. On the taskbar ,there is a local connection icon,but when i click on it,it simply says that there are no available networks.. When I try to connect to a network as usual or by strictly following the instruction manual that came with the device,it ends up the same,can't find a network.
I figure that I need some drivers,but since my laptop came with freedos system,and drivers for that one,I don't know which ones do I need for windows 7.
Could someone help me with this?
Oh,and if it means something,my service tag is .