Reset Password of 'sa' account

Use command prompt is also an easy way to reset lost sa password. See the commands below:

Method 3: Use Command Prompt to reset your lost SQL sa password

Step 1. Open a command prompt (Start -> Run -> cmd)
Step 2. Type the follow commands, and press Enter after each line:
      Osql -S yourservername -E
      1> EXEC sp_password NULL, 'yourpassword', 'sa'
      2> GO

Of course, you can reset your other sql account password, just by changing the 'sa' to your another sql account name.

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