for running 'playstation 1' game u can use these emulators :
1) EPSXE
2)Bleem
I have used EPSXE and it is good , needs a littile configuring though.
There are some 'Playstation 2' emulators that are currently work in progress I don't know if any r available yet.
There r another posts abt this topic --- use the search function.