@VictorXY Welcome to HP Community!
Note: Please ensure the complete product name/number for a quicker response from the community, as we need to know what we are dealing with to provide an accurate solution:
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If you aren't able to enter the password, and you've got windows 7 pro, perhaps, you should also let us know if the OS came with the PC or you installed it on your own, if you installed it, please switch back to the OEM to resolve the issue,
And if the device was shipped with it, please get back to us with the above details for precise solutions.
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Riddle_Decipher
I am an HP Employee