Moving to a new Visual Studio 2005 environment, same .Net framework specified, but getting lots of errors

Question

So I am moving a project from VS2005 on XP to VS2005 on Win7 and getting lots of errors like the following:

Type 'DataGrid' is not defined. Type 'Exception' is not defined. Type 'ListBox' is not defined. Type 'TextBox' is not defined.

I made sure all my projects are targeting the .Net 2.0 framework as before, so would would be different and cause all the errors?

Thanks in advance,

Tom