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In any case, if we assume the operating system has been locked, you're in luck as there are plenty of quality products that will allow you to unlock any account with a forgotten password. One which I frequently use is Winternal's ERD Commander 2005. The program is able to run directly from a CD, allowing you to boot from it and reset the administrator's or any other user's password.
If on the other hand you are referring to unlocking passwords set via the system's BIOS, then you do have a problem as no vendor gives out any of the in-house tools that will allow you to perform such tasks. In this case you will be forced to continue sending the laptops back to their vendor, so you don't void their warranty!
This was first published in April 2008