How to factory reset Model No. p7-1267c

[jsantav]

I am trying to clean out everything from my desktop and set it to factory reset. I no longer use this desktop so I am giving it to a friend which is why I want to set it as factory state. How can I clean out everything or set my desktop to factory state? I think it runs in windows 7. 

[Prométhée]

Hello
under the condition of not having modified the pc mainly the reinstallation partition and the windows version
the pc must be reinstalled With recovery manager, or by f11 at startup!
Otherwise, and what seems not to have been done, you must use the reinstallation kit

Performing an HP System Recovery

 Performing an HP System Recovery (Windows 7)

Creating Recovery Discs or Saving a Recovery Image to a USB Flash Drive (Windows 7)

Creating and Using a System Repair Disc (Windows 7)

Obtaining PC Recovery USB Drives or Discs

[jsantav]

The model number for my desktop is p7-1267c

Product number is QW785AA#ABA

HP Pavilion Series