1) .NET Framework 3.0 RC1 (containing WF RC5) Not required for Vista http://www.microsoft.com/downloads/details.aspx?FamilyId=19E21845-F5E3-4387-95FF-66788825C1AF&displaylang=en 2) Windows Vista RC1 SDK (optional provides SDK samples and help) http://www.microsoft.com/downloads/details.aspx?FamilyId=117ECFD3-98AD-4D67-87D2-E95A8407FA86&displaylang=en