How to change SQL Server Service log on account using cmd command or powershell?
asked Jun 14 '11 at 10:54 PM in Default
Before you go too far down this path I would strongly suggest looking at this Microsoft article for guidance on the ramifications of doing it and the related changes required.
If you are going to try via a CMD script you may want to investigate using the SC command with the config option.
SC config [service name] obj= [account] password= [password]
answered Jun 15 '11 at 06:24 AM
To change the service account in SQL Enterprise Manager:
In doing it I can say it should set all the OS level permissions that it needs, but it would not hurt to take the KB article @Blackhawk-17 provided to just verify the settings are correct.
FYI: If you had provided the version of SQL Server you were running an answer would have come to you much quicker. Just saying :)