When trying to install MOSS 2007 I received a strange error: "Set up is unable to proceed due to the following errors: This product requires at least Windows workflow foundation version 3.0.4203.2 which is part of Microsoft .NET Framework 3.0"
I spend a lot of time to see what the problem could be and when I finally found a solution it was relatively simple to implement.
Or on Server Management, add a the Feature .NET Framework 3.5.1