unable to start security center service

Hello,

one of my customers security center service doesn´t start at boot.

Manually starting the service with the default user account isn´t possible.

The user account settings of the service are unknown for me at the moment.

The repository consistency is unknown.

NOD32 antivirus is running but Vista Home Premium is showing "Computer is

unsecure".

Please let me know how to force that the security center service get

startet.

Thank you.

Dirk Lehmann