Goto
www.crucial.com for the ram, you should be able to plug in your model to there site, and it will tell you what you have.
As for Drivers goto
http://support.dell.com and plug in your Service code, it's on the back of the machine. It will give you a listing of every driver for that machine. Download'em, burn'em and be done. Do it before you crash otherwise you're FUBAR'd.