Thanks for your opinion guys.
As I said in my first post, I am not looking for perfection, just a friendly configuration for my hardware.
Diego Sanchez looks like very happy about his configuration, maybe I could follow the same way.
GroovyMAME is not my area, I would like to have your recommendations in relation to which range of GM versions can match with XP 32 or 64, where I can find them..
If my graphic card is compatible with the last driver 2.0 and so I could go for Win 7.
Hopefully, someone has already done some test about. Thanks!