Karloff
As mentioned by others in this thread, check that following requirements are met:
- You have installed Visual Studio 2003 (if you use BizTalk 2004) or Visual Studio 2005 (if you use BizTalk 2006) with C#. Open Visual Studio and check if you can create a C# project - if yes, good. If no, run VS installer and install the C# component.
- You installed .NET framework, Visual Studio, and BizTalk to their default locations on the C: drive - I never play around or change these install locations as it usually messes up things badly somewhere along the lines. If you have all those in default locations, good. if not, uninstall BizTalk, uninstall VS and try again. You may have to clean up your registry if any of these uninstalls leave entries behind.
- Not sure if language locale affects BizTalk and VS, but I'd have the same locale for both, e.g. all english or all german.
If none of that helps, grab a Virtual PC copy and perform a clean install (highly recommended anyway if that's your development environment for BizTalk) and make sure to leave default installation paths in order as well as installing the C# option for VS (default VS installation option does that).