Inspiron 3521 Cant Install bcm4314a00 and Network Controller

Hi

I tried almost 10 different driver files and it wont install. It says FAILED in installation dialogue, or simply says It is not installed correctly then when you click Install with recommended .. It says wrong platform.

I have preinstalled WIN7 64 and install drivers in order specified by Dell support site

Please help. I spent more then 5 hours trying to solve this problem

Thank you