No Sound Device

Hello,

I am running Windows XP and recently had to undergo a complete system reinstall, had the system wiped. Now that I have reinstalled Windows, my computer won't recognize my sound devices. I have an E-Machine T3103. I went to the website for that computer model, and downloaded the Audio Realtek Driver..but, it's sitting on my desk top now, and my computer still has no sound.

I know virtually nothing about computers, and am asking you all for step by step very clear advice here..I need my sound after going three weeks without a computer while my friend was "fixing it"..and am now finding it has brand NEW issues as soon as I get it back. I'm losing my mind. Help!