We know that some people are having difficulty with the Visual Studio 2005 installation process and so we have some resource pages available right now. This weekend, we posted a tool to help clean up a previous installation (Beta 1 or CTP) before installing Beta 2. Here's the list of documents and tools currently available:
Visual Studio 2005 Beta 2 Install Issues
This page contains links to the uninstall pages for both Visual Studio 2005 and for the express editions. In addition, this page contians a link to a new uninstall utility that can help you clean up if your uninstall didn't finish properly.
Uninstall Beta 1 Visual Studio 2005 Express Editions
This page contains the steps for uninstalling express. If you follow this in order, you should be set to go.
Uninstall Beta 1 Visual Studio Standard, Professional Editions
Same for this one. Follow the steps and you shouldn't have any trouble with your installation of Visual Studio 2005 Beta 2. If you do have trouble, see the Install Issues link above.