If you are really running Vista as the OS and it is not a modified version for a particular business use, it should be fairly easy. At worst, you can reinstall the OS but investigate the NTPassord program. If the password is a BIOS password, it will be more difficult. You will know pretty fast when the password reset is tried.
If the other laptops can be used and logged into, it would be important to add another administrator account for the owner, to each computer before this happens again.
I'm not an HP employee.
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