Copy the contents of job_schedule1_mssql.sql into your query window. The script is located in the install directory. The default location is C:\Program Files\VMware\Infrastructure\VirtualCenter Server.
Select your VirtualCenter database from the Database dropdown.
Execute the script.
Repeat steps 2-5 for job_schedule2_mssql.sql and job_schedule3_mssql.sql.
When using sql server 2005 express you get no performance data, for the past week, month or more.
This depends on the lack of sql server agent in express edition.