Windows XP Professional (SP2 or later), Windows Server 2003 (SP1 or later) or 2008 R2, Windows Vista or 7 (Home Premium, Business, Enterprise or Ultimate), Internet Explorer 7, 8 or 9, Microsoft .Net Framework 3.5 (will be installed by the platform if not present) and an Intel dual core processor, 500 Mb of disk space and 2 Gb of RAM. So that's probably your problem! Richard