Microsoft Sharepoint 3.0 + Microsof Office InfoPath 2007 + Microsoft Visual Studio 2008

First of all, you heed to download all necessary software:
Microsoft Visual Studio 2008

http://www.microsoft.com/downloads/details.aspx?familyid=7BF65B28-06E2-4E87-9BAD-086E32185E68&displaylang=en