my system should run it perfectly
If your friend said that he is also new to this. No emulator is perfect but some are very close. Pcsx2 is a great emulator and runs a lot of game at playable speeds. Its a simple rule of more power the faster. Sure your rig is ok to play a few games but not all. There are a lot of speed guides.

If you want to truly get it running faster get intel hardware and remember the faster the chip the faster the game.