I have changed the account that the SQL Server (SQLEXPRESS) service is running under, namely, changing the account from "Network Service" to my current user account.
However, if something goes wrong, I would like to be able to change it back and I am concerned that since this is a built in account for which I never knew the password, that I will not be able to set it back w/o knowing what the password is.
Which password I can use