I'm trying to upgrade a Windows Server 2003 (Standard R2 SP2 x64) machine to Windows Server 2008 Beta 3, but I'm getting a compatability error that I can't work out, and I'd appreciate it if anyone can help me get around this problem.  The message it's giving me is:

You must make the following changes before upgrading Windows

    Uninstall the following Windows components and features:
    • Windows Internal Database - Please read Microsoft Knowledge Base article: 934345

I can't seem to find that knowledge base article, and when I followed the instructions I found in another knowledge base article about removing Windows Internal Database, a message popped up saying "This operation is only valid for products that are currently installed."