WinFX and Visual Studio 2005
We received this useful information from the Connected Systems team...
All of the bits distributed at the PDC were concurrently made available for download on MSDN under the name, “September CTP.” For WinFX users, it is important to know that the September CTP releases of Visual Studio 2005 and SQL Server 2005 are not compatible with the September CTP release of WinFX; the September CTP release of WinFX works on Visual Studio Beta 2.
For a fully-featured WinFX September CTP environment, the best option at present is to install these pieces in this order:
WinFx Beta 2 will be out in December, along with Vista Beta 2, and it will be compatible with the final release of Visual Studio 2005.