I LOST MY DRIVERS CD, HELP!!!

I either lost or never received a drivers CD when i bought my iMac, but i installed Vista with boot camp and now cannot use the internet, hear sound, play games (graphics card isn't installed) or anything! Where can I make a new CD to use to download the drivers needed for my iMac 24 inch os X?? BTW, it has 4 gigs of ram, not sure if you need that info and it's dual core. A quick reply would be nice cause i need to use this for work soon! Thanks

p.s, why can't I instal XP in bootcamp?? I tried, but when i reached the blue screen that says "press ennter to continue, r to repair, and escape to exit" the keyboard stops working and I am unable to continue.