I just had this problem, had not used the content center, first time I go to use it its not available.
I must have glazed over that error during the initial installation.
I contacted autodesk support, they got me up and working.
Here is what needed to be done to my machine.
Uninstall all listing of Microsoft SQL Server in Add / Remove programs (should be ~4).
Check for SQL(AutodeskVault) under services.msc
If it is listed, run sc delete mssql$autodeskvault from the command prompt (or Start -> Run)
Instert Inventor DVD #2, and run Setup.exe from D:\support\SQLExpress.
Install SQL, be sure to remove the check for Hide Advanced options.
Name the instance AutodeskVault, change the authentication to MIXED, and set the sa password to AutodeskVault@26200
Once SQL has installed, then run setup from Inventor DVD #1 and all should be well!
Hope this helps you
Thaddeus