Everything (hardware and software) that works with Vista should work with Windows 7 also. So that part of the answer is "yes".
I can't comment on the graphic performance. I'm sure somebody else can.
ok so with with vista everyone knows that with all the pretty but useless graffics on it it tends to take up alot of cpu and graffics memory(best way i know how to explain it)does windows 7 do the same thing or is this one of the thing that has been redone cause vista realy sucks as a gameing platform as far as i am conserned and also is windows 7 backword compatable can you use older hardwere and softwere with it also since i ma kinda new to computers an explanation in lames terms not geek terms would be great thanks!!!!!