We recently underwent a domain change and now I seem to no longer have the ability to do anything in SQLEXPRESS. I can connect to it with SQL Server Management Studio, but I cannot access any of the databases therein, and I can't make any changes to any settings. It keeps telling me that I do not have permission to do the things that I am trying to do.
How can I set my new domain login as the owner again so that I can get access to my databases in SQLEXPRESS?
UPDATE: I did not use the suggestion below to solve my problem, but while investigating the recommendation, I determined that a local version of the old domain profile still existed on my machine. Fortunately, this profile held all of the same rights as the old one did, so I was able to log in to that and set my new profile as sysadmin.
From there it was a simple task to update ownership on my databases with 'EXEC sp_changedbowner [*new_profile*]' in sqlcmd and I am back in business.
Thanks for the help!