Change Cluster Account Password KB

Note: In Microsoft Windows NT 4.0 and Microsoft Windows 2000, to change the Cluster service account password, you have to stop the Cluster service on all nodes before you can make the password change

To Prompt for password, use the following parameters: (Password will not be visible while being typed and it will prompt for confirmation)
cluster /cluster:EASTCLUSTER /changepassword /skipdc /force

http://support.microsoft.com/kb/305813