Hi,
Make sure you have installed .NET 3.5 SP1 on the server.
http://www.microsoft.com/downloads/details.aspx?FamilyID=ab99342f-5d1a-413d-8319-81da479ab0d7&displaylang=en
Make sure you are using the mojoportal-2-3-0-4-b-mssql-deploymentfiles.zip, the platform installer does not work with the -sourcecode.zip
To use the -sourcecode.zip you need Visual Studio 2008 SP 1 or Visual Web Developer Express 2008 SP1 to be able to compile the solution before using it.
Hope it helps,
Joe