"[MS Visual Database Tools] - Invalid class string." error

[equipe9]

We recently upgraded our SQL Server 2000 to SP4 and are now getting the following error whenever we try to open up Site Diagrams.

An unexpected error happened during this operation. [MS Visual Database Tools] - Invalid class string.

This is very frustrating since I can't easily edit my database relationships or see my ER diagram.

Any ideas how to fix this?

Thanks

[Rawhide]

Check this article and install the post-SP4 hotfixes and see if that helps: http://support.microsoft.com/default...b;en-us;884525

[equipe9]

Rawhide,

Thanks for the suggestion, however none of the post SP4 hotfixes have any relevance to the issue I am currently experiencing.

Re-install of SP4 might be in order unfortunately.

[Rawhide]

You might be surprised and find out that it does. Sometimes a single issue can cause multiple problems.