When installing vCenter 5.1 you may get the error message:
“Error 32010. Failed to create database users. There can be several reasons for this failure. For more information, see the vmMSSWLCmd.log file in the system temporary folder”
You can find the location of vmMSSQLCmd.log in
The reason for the error should be in this file. In my instance it was because the passwords chosen for the RSA_DBA and RSA_USER accounts did not meet windows complexity requirements. I changed the passwords to something more complex and the install completed successfully.