I'm following your instructions on setting up xp using your drivers at this page. http://www.greenfoot.org/topics I have installed sp2.and sp3. The cpp library installs as well as the .net stuff. But when I get to openni-win32.msi I get an error 'there is a problem with this windows installer package. A program run as part of the setup did not finish as expected. Contact your support personel or package vendor.'