Getting the right drivers for your pc?

I reinstalled win 7 on my hp dv6 1378nr. Since then it has never been able to recognise wireless signals like it used to do before. I want to download its drivers but i dont know what description to provide and the site to get it free. Its a 64 bit pc. I have tried starting the WLAN at service.msc, it didnt work. If there is other way pls let me know but will still need the drivers.