My screen is upside down, please could you help me to correct it ? Thank you very much

Your screen is upside down? Oh no! Lol. This is a simple feature that comes with windows 7. You probably encountered it by accident. Just push alt+ctrl+up key. If this doesn't work. Find more information by clicking here.. https://support.microsoft.com/oas/default.aspx?gprid=14019&st=1 or typing it in, in the address bar. Click on which windows 7 you have, home premium, professional, ultimate etc. and contact HP for more information if alt+ctrl+up key doesn't work. =) hope this helps!