@CSaettone
Greetings and Welcome to the HP Support Community.
Don't worry, I'm here to help! To better assist you - What's the model name of the computer? Refer to this link for steps to find the product details. (Ensure not to share the serial number, email, phone number, etc.)
While you respond to that, please refer to this document for steps - HP PCs - Numeric Keypad Does Not Work
Hope this helps!
Let me know how that goes.
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Have a great day ahead 🙂
Asmita
I am an HP Employee