How to Enable/Configure sa User in SQL Server 2005
First of all, SQL Server Log In is to be enabled.
# Right click on sa or other user you want to enable and click on Properties.
# In the left Pane select General, change and confirm Password in Right Pane for User if it requires.
# Select Status in Left Pane and check Enable under Login in Right Pane.
# Press OK and restart the SQL Server.
A Rahim Khan