In this Quick and dirty post, let’s see a simple fix for one of the annoying error messages you’ll see in SQL Server 2005. Basically, You’ll see below mentioned error in few cases when you try to change the sa password using SSMS.
The Simple trick is to check the box “Map to credential” as shown below after providing a new password and click Okay.
This should work…Hope this helps!
MSSQLTREK 