WLan drivers and other drivers installed but not working

Can anyone help, I have re-installed windows 7 home premium 64 bit

 and also the drivers from the original cd but...

It just won't connect to the internet.

The laptop can't access wifi and it won't connect via an ethernet cable either.  The laptop was connecting to the internet before re-installing windows, so I'm confused as to why the drivers just won't or don't work and it won't now connect.

I have checked the drivers in device manager and even though I have installed them from the original cd they are not showing up and so are still showing yellow exclamation mark as no drivers installed.

be grateful for any assistance.

thanks