Dell Vostro 1015 wifi problem

Hi there. I just bought vostro 1015, but I have problems with the wifi drivers (or something else connected to the wifi). I can't install the drivers. It says QMI Module not exist.     I'm with windows 7. The device manager says it's fine, but i can't connect to the internet. I saw a lot of people with the same problem but they all had windows XP. Is there any solution for windows 7?