Bit late and not really very helpful, but I have found that Sonicstage 4.3 loads and kind of runs on my Windows 7 64 bit computer. What I mean by kind of runs is that the program opens up and runs but will olny let me use it for CD burning and not the "net MD Walkman" for which i have used it for in the past on my old XP computer to produce mini disc recordings. The major problem, sa I understand it, is that there are no 64bit drivers available for the mini disc recorders and therefore, as they can't be recognised by the computer system Sonicstage is not able to "see" them and therefore cannot give the option of recording to mini disc. This is as I see it at the moment and I don't see any change happening as SONY (Bless 'em!!!!!!!)have stated that they are no longer producing or supporting this format. (Did they ever really support it?) If anyone has any further information on mini disc drivers it would be useful