After installing Office 2010 Beta I encountred issues with visual studio, the designer and split view freezes visual studio and caused the application to crash.
on this site I found the solution.

If you get this problem then there is a simple solution, well, one that worked for me. You need to run a repair on the “Microsoft Visual Studio Web Authoring Component” that is part of Office 2007.

You can find the setup in the following locations:

Windows 64bit

C:\Program Files (x86)\Common Files\microsoft shared\OFFICE12\Office Setup Controller\Setup.exe

Windows 32bit

C:\Program Files\Common Files\microsoft shared\OFFICE12\Office Setup Controller\Setup.exe