http://www.microsoft.com/downloads/en/details.aspx?FamilyID=24da89e9-b581-47b0-b45e-492dd6da2971&displaylang=en The Microsoft Application Compatibility Toolkit (ACT) version 5.6 contains the necessary tools and documentation to evaluate and mitigate application compatibility issues before deploying Windows 7®, Windows Vista®, a Windows Update, or a new version of Windows Internet Explorer® in your environment.