enabling password expiration using windows 7 starter

I'm trying to enable password protection on my netbook (windows 7 starter) by issuing the following line command:

wmic path Win32_UserAccount where Name='xxxxxx' set PasswordExpires=true

where xxxxxx is my userid. This fails w/ the following response:

ERROR:

Description= Generic failure

The userid I've logged on to has administrator privileges. Let me mention that a month ago my netbook would not start and I had to recover my system from a backup. This command worked for me prior to this event.

Curiously, the following command works fine:

wmic path Win32_UserAccount where Name='xxxxxx' set PasswordExpires=false

Any help is appreciated.

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