Hello,
i have an integrated sound card and network card. For some reason mac doesn't seem to recognise them, what do you recommend me to do, buy a new sound card and a new network card? is that possible? Or do you think it is best to find 3rd party drivers? where can i find them and how do i install them?

Thanks!!!

Which sound codec, what ethernet chipset? You need to give a bit more info than that.

i have a "NVIDIA nForce Networking Controller" and "realtek AC'97 audio".

here
and here
for audio.
I think you'll find that that's not the name of your codec.