Finaly!!! i've understood why i couldn't install the drivers!!
it is a windows 8 problem... you cannot install unsigned drivers...
For those who cannot install drivers and are using windows 8, google for "windows 8 install unsigned drivers"
https://www.google.pt/search?q=windows+8+install+unsigned+driver&oq=windows+8+install+uns&aqs=chrome.1.57j0l3j62l2.14896j0&sourceid=chrome&ie=UTF-8
or check this url:
http://www.craftedge.com/tutorials/driver_install_windows8/driver_install_win8.html
you can find the drivers here:
https://mega.co.nz/#!SxhAAJrS!QmG35HK73J2IPa04qG9e7USFCc1cmN2A2vku6pbbGOo