my System Vista 4 gig ram 250gig hd Service pack 2 IIS 7 fully installed Plesk is very buggy, i haven't even started to add domains yet because i get this error when I try to install plesk "Error 1720. There is a problem with this Windows Installer package. A script required for this install to complete could not be run. Contact your package vendor" It would be really good if the installer can check your system requirements/config first because according to the site mine dose meet the requirements but yet fails to install. Why do i get this error and how do i fix it? Starting to think this software is not for our company....... Make me think otherwise!