ndiswrapper, where to find wifi drivers in Win 7

view full story

http://askubuntu.com – I have some problems with Wifi at my Lenovo Z575. Under Win 7 Wifi works fine, so I wanted to install exactly the same drivers under Ubuntu with ndiswrapper. My question is: where the drivers are located under Win 7? I tried to download the drivers from the vendor's site (Ralink) but with the downloaded drivers I still have some problems (HowTos)