WMI Provider Error - Access is denied - while changing SQL Server account password

To give this right:
Login with administrative privileges to SQL Cluster nodes.
Click Start, type mmc in the Search programs and files box, and then press ENTER.
On the File menu, click Add/Remove Snap-in.
Under Available snap-ins, double-click WMI Controls, and then:

• Select the computer that you manage. Connect to: select Local Computer, click Finish. Click OK.
• On Console Root tree, select WMI Controls, right click, select Properties, then go to Security tab, locate root\Microsoft\SqlServer\ ComputerManagement10 (or 11 for SQL Server 2012) namespace then click Security.
• Add new domain user to Group or Users Names
• Select new domain user in Group or Users Names and Allow Read Security for the Permissions of new account, click OK.