Windows Vista v XP

Hi I bought a notebook and it had Vista on it 🙁 So i decided in my infinate wisdom lol to put XP on. Since doing so i have lost my sound card and my wireless what can i do? I have tried installing the AC97 drivers for my sound card and the correct drivers for my Wireless but they just come up with an error: cannot continue. I am at my witts end with this now and i did not create a system restore disk when i got it ( I know I am stupid )please can someone help me?

My Notebook is an EI-machine 3115

Dougie