After bootcamp windows wifi connection

Hello

i have installed via bootcamp Windows 7 pro on my iMac (21.5-inch, Mid 2011)

everything went well but after installation of windows it can not find the drivers for my network

device I have pointed to the bootcamp USB for windows that Bootcamp downloaded

it can not find nothing it say to find windows

32 or 64 drivers.

Were or how do I get the drivers for windows 7 pro for my network device of my

iMac (21.5-inch, Mid 2011)

thank you