I want to reset my windows to factory state how to do ? HP 625

Hello guys,
I have an HP 625, it cames with windows 7, now I want to recover the windows as the factory state,
I can't find the recovery software in the windows menu, and when I press the F11 in the windows startup it doesn't do anything, what should I do ? thank you in advance

 

I don't know much about doing this sort of thing, but I did it once with my HP laptop by going into my setting and looked for the recovery section. I can't remember since it has been a long time. I did a quick search and I thought this article is a good one to read: http://www.pcadvisor.co.uk/how-to/laptop/factory-reset-laptop-image-3462995/

You can do the search and see if any of those helpful link works out better for you!

 

for the link you posted here, the F11 doesn't works that's the biggest problem, I'm searching about other ways to do it since my CD Reader doesn't work, if I find anything I'll post here