Installed SQL Server 2008 R2 - sa password
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For SQL SERVER 2008 R2,

In my company, they give me a computer which was used by another employeer.
SQL Server 2008 R2 was installed but I don't know 'sa' password.

When I want to alter login, it gives below error.

"Cannot alter the login 'sa', because it does not exist or you do not have permission."

When I want to restore a database, it gives pergaimission error again.

(When I enter the Security --> Logins --> sa --> Properties 
windows authentication is disabled.)


Can I change it?


P.S: Password is not "password" :)

