Mine is windows xp 32-bit sp3. no problem playing at all.
the midisoft is a bit quirky but managed to get it run.
the midi must be setup to General MIDI for some midi files.
got all the sound and fun fare.
however i did disable the midi input.
need to add:
you dont need any usb-midi cable or anything else to even get started.
it comes with excellent MIDI files for you to toy with.