I downloaded this build and had the same problem on win xp pro sp2
first a copy failed message during the install, then a pop up message about guile.exe
Later I installed it without any problems whatsoever on win2000 pro presumably the install problem is specific to win xp pro. I really cant
provide any more information about this without some assistance on what to look for or where to look. If anyone has installed these latest builds on win xp sp2 or win xp pro sp2 sucessfully I would like to know
as I would then try to install lilypond on win xp without service packs as a trial.