I recommend to stay away from anything but the winxp version - regardless of your OS & bits. I got a lot of bug reports which were solved just by using this version (neogeo going bonkers, recorded inputs going out of sync, off the top of my head). In fact, it shouldn't even be called the winxp version, it should be called the gcc version, also gcc is what the active devs use (iq, dink, JacKc).
best regards,
- dink