It installed fine on my Vista Ultimate, although I read somewhere that you have to have version 2 for it to work.
Version 2 was the one with the 'hot coffee' mod removed. It should say on the disc somewhere version 2.0 or on the packaging. Version 2 was packaged as a hard back book with the disk on the back cover... I dont know how to explain it, it should say somewhere.
wow... wait for IV to come out. SA is so boring now.