Disable Auto Password Change in Windows.

In Windows NT versions 3.51 and later and in Windows 2000, Windows XP, Windows Server 2003, Windows Server 2003 R2, Windows Vista, Windows Server 2008 and Windows Server 2008 R2, you can disable the machine account password changes on a workstation by setting the 

DisablePasswordChange

registry entry to a value of 1. To do so, follow these steps.
Start Registry Editor. To do so, click Start, click Run, type regedit in the Open box, and then click OK.

1. Locate and then click the following registry subkey:
   HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Netlogon\Parameters
2. In the right pane, click the
   DisablePasswordChange
   entry.
3. On the Edit menu, click Modify.
4. In the Value data box, type a value of 1, and then click OK.
5. Quit Registry Editor.
   

In Windows NT version 4.0 and Windows 2000, Windows Server 2003, Windows Server 2008, and Windows Server 2008 R2, you can disable the machine account password change by setting the 

RefusePasswordChange

registry entry to a value of 1 on all domain controllers in the domain instead of on all workstations. To do so, follow these steps.