We have recently found that HTML Accessibilty checker may be broken in Whidbey May 2004 Preview. Create new HTML page or a Web form. Click Tools | Check Accessibility and click OK. If all you see in the Output window is “Checking accessibility...“ then setup is broken. Here is how to fix it: locate htmlchkr.dll and fpsrvutl.dll - they should be somewhere under Program Files\Microsoft Visual Studio 2005 and move both of them to Program Files\Microsoft Visual Studio 2005\Common7\Packages. Both DLLs should be in the same location as htmled.dll. If this does not fix the issue, please let me know.