Yes , you should, try to add a domain account and add this account on the administrator group on your vcenter server, and add it on your DB. And try.
Running vCenter Server using a user account
You can use the Microsoft Windows built-in system account or a user account to run vCenter Server. With a user account, you can enable Windows authentication for SQL Server, which provides added security.
The user account must be an administrator on the local machine. In the installation wizard, specify the account name as DomainName\Username. You must configure the SQL Server database to allow the domain account access to SQL Server.
Regards,
Julien.