Can't get wifi driver to work on Asus K55A laptop

So I wanted to restore my PC by down grading from win8 to win7 ( I've done that many times )
but I never use the same .iso file, and this time, when I download the proper file to get my wifi working ( I'm using an asus k55a ) it unfortunately doesn't work.

It says "The installation XML file is either missing or corrupted. The setup application will exit! "
I've searched and I couldn't find any help to get this problem gone so I decided to go back to window 8, but I'm not able to boot from any .iso file, neither in window7
For some reasons I can only boot from DVD/CD but when I get to boot nothing happen ...

So I'm a bit stuck here, if someone could give me any advice that would be much appreciated,

regards, william.

Yes.
There is the link for my laptop:
ASUSTeK Computer Inc. -Support- Drivers and Download K55A
Still says the file is corrupted.

Hello Maxie, I am actually on window 7.
For the wireless card, I am not sure.

No, I only downloaded the wireless drivers

So I downloaded the chipset drivers and neither 64 bit and 32 bit are working,
a message appears when I launch the setup:
This computer does not meet the minimum requirements for installing the software. Setup will exit.

And when I get to my device manager, I cannot see any wireless driver there, it's like if it was deleted of something.