console games such as playstation and xbox family console games are rather hard to emulate, i havent seen anyone able to do it. even the nintendo DS is a bit tricky and will run too laggy to be useful. nintendo 64 and gameboy advance run good though.
from the below link you can get all the emulators and ROMs (the games) you could ever hope for. just download the emulator, install, and download the corresponding ROMs.http://www.coolrom.com/