Bootcamp Support Software

Hello

I am on a Macbook air Mid 2013

Using Windows 8.1

And i have no sound, internet, camera, trackpad gestures and keyboard shortcuts.

This is because i can't install the bootcamp5 support software.

I have tried all of the different ones, but they all say when i open setup.exe this application won't work on this pc.

I am really frustrated so does anyone have any ideas to why it isn't working?