After I installed VS2010 RC1, BizTalk 2009 fails, the reason is the Enterprise Single Sign on service fails.
To fix it go to the Enterprise Single Sign_On folder in VS command prompt and re-register the dll.
Errors in event log:
The description for Event ID 7023 from source Service Control Manager cannot be found. Either the component that raises this event is not installed on your local computer or the installation is corrupted. You can install or repair the component on the local computer.
If the event originated on another computer, the display information had to be saved with the event.
The following information was included with the event:
Enterprise Single Sign-On Service
The locale specific resource for the desired message is not present
Regasm “C:\Program Files\Common Files\Enterprise Single Sign-On\ssosql.dll”