GT

OS: Windows Vista Home Premium

Standard user can turn off Security Center Alert without requiring a
administrator password credentials. Standard user account should be
restricted on changing Security Center Alert and only the Administrator can
change Security Center Alert.
This should be change in SP1. Why would you allow a standard user to turn
off the security center alert in the first place? for convinient,
administrator create standard account to restrict user from changing the
setting and letting a standard user change this setting is a mistake.