Database Diagram in VS 2005 for SQL Express 2005

I have installed VS 2005 (Beta 2.050215-4400) and SQL Server 2005 CTP (File Version 9.00.1187.07).

I can connect to the SQLEXPRESS database and created tables from the VS 2005. But when I try to click the + to expand the database diagram folder I get the following window:
Microsoft Visual Studio

This server does not have one or more of the database objects required to use database diagramming. Do you wish to create them?

Yes No Help
After I select yes, I get the following error message:

Microsoft Visual Studio

Could not obtain information about windows NT group/user 'xxxx/xxxx', error code 0x5.

OK

The + next to the database diagrams folder disappears. I select the "Add new diagram" menu item from the database diagram folder. I able to add tables to the database diagram. But when I try to save the database diagram, I get the following error message:

Microsoft Visual Studio

(Exception from HRESULT: 0x80131904)

OK
Does any one know why?

This is a pretty old build of VS (Feb) and I believe we still had some issues back then.

Database design

I just downloaded VS 2005 beta 2 and am learning about the new features and getting acquanted with it.

I used to do all the database design in Visio Enterprise Architect. Is there a replacement for Visio in VS 2005? Or we continue to use visio to model our databases? I want to be able to create a model that I can deploy in not only SQL Server.

Thanks in advance,

MCHi
There is no such replacement for visio in Vs 2005. One can continue to use visio for modelling the db