One option is to download a playstation emulation such as ePSXe, then pick up a few secondhand figthers from you local games store for a couple of quid each.
I actually had a few old playstation games lying around (I gave my playstation away a few years back and found so old CDs recently). I have now ripped these onto my PC and play with an emulator.
Tekken 2/3 and soulblade are all 3D and quite good fun.