Two different Dell laptops (C610 and D600) with windows XP installed behave different with powermanagement.
On both laptops the users have only restriced user access rights and are not part of a domain.
On one laptop (C610) the user can without problems change the battery power settings. On the other laptop (D600) the user gets the error mentionned above.
Microsoft treats this problem in: Q307066 http://support.microsoft.com/default.aspx?scid=kb;en-us;307066
They say however that the only solution is to give the user local administrator rights. This is not an option in my case and apparently this is not necessary. On one laptop it is working like I wish.
How can I enable all restricted users on every windows XP laptop to change the power management settings?