The easiest option would be to use Remote Command. You can use this on one or more target machines. To do this right click on the appropriate Collection (or individual machine, depending on how many targets you wish to change) and select Tools\Remote Command and type this into the command field.

net user Administrator NEWPASSWORD

Obviously, the NEWPASSWORD value will actually be the password you want to use. If the Administrator is not the correct username then change it accordingly.

Thanks. worked like a charm.

-paddy