:emotion-2:

Please list your Dell model number and version of windows. Dell Inspiron 3543, windows 10

In the meantime, you can see the correct service tag number in the BIOS by following steps below:

1. Power off system

2. Power on system, quickly start tapping the F2  key continuously until you see the BIOS setup.

Also,

Please watch Dell video below, hopefully it will be a help to you.

This is someone trying to remove a password from a locked system - call Dell with verification of ownership of the system.