Wireless not working after reinstallation

Hi everyone, I have a emachine G560Laptop and I have just recently formatted and installed a new Windows 7.Help please. I can connect with LAN though.
 
You may need to download drivers but there is no eMachines G560. There is a Lenovo G560 laptop. Once you install Windows 7 you are just at the start because there are loads of updates before you get back to where you were.
 
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