6.x was the last supported on Windows XP, I have been using it since i purchased the Digi about 6 years back and had absolutely no problems out of it, with 2ghz processor and 2gigs of ram tons of plugins.....i am about to finally move my set up to Mac only because I am building a new lab out, other than that I think you can look around on ebay and possibly get a copy of the XP and at one point Digidesign had it for like 40 dollars, but I think you had to have a previousl license?