This means that you need to give the required information when you first start the system like your Name The Product Key and whatever else is asked for before you can get into Windows.
If you failed to correctly finish this process it's possible that Windows Security has come into Play and is insisting that you have a Pirate Copy of Windows Installed and has shut it down.
The solution here is to either Rebuild the System from scratch by using the Reinstall Option provided or ring the Makers Technical Support in your area for a solution that involved reinstalling the OS & everything else from scratch.
Because I don't support Vista in any way Shape or Form I'm not exactly sure what is involved here but at a guess I think it involves totally removing the Existing OS and reinstalling to a Blank HDD.
Vista is fairly aggressive in protecting M$ Copyright and needs to be treated gently.
Col