I'm running XP Pro and have no problems whatsoever with the audio recorder, I would suggest you try stopping all programs running in the background first if you are having problems. I have no interference whatsoever on playback of recorded music and audio even though I have McAfee Firewall Plus and virus protection running in the background.. But I do have a very fast processor and 500MB of RAM, perhaps this helps.. who knows.. all I can say is that it all works rather well and far better than I ever expected. I played my first gig with the 7000 on Sunday using exactly the same settings on my mixing desk as were used the night before with the KN6000 (in the same venue) everyone of my regulars liked the sound qualities of the new keyboard and said it was " A fuller, more mellow sound"