i accedently deleted everything on my computer,please help me

[zamks]

i have a windows 7 computer desktop and i upgraded it to windows 10 but i accedently deleted everything (files,programes...)
and when i open my windows it says no operetion systeme detected
and i tryed a lot of things and watched a lot of vids but nothing did help
i dont have CD that can install windows 7
i dont know what i need to do or install

[old_geekster]

@zamks, welcome to the forum.

I suggest that you begin tapping the "Esc" key when the computer begins to boot.  This should bring up a Recovery menu.  You can choose the option that applies to your situation.  If you this doesn't work, here is a guide to help you order the Recovery media.

Please click the Thumbs up + button if I have helped you and click Accept as Solution if your problem is solved.

[zamks]

yes i know that but nothing did help me in that menu
thanks for replying

[old_geekster]

You are welcome, @zamks.  Thank you for the additional information.

Here is a link to a guide that will help you order the Recovery media:

http://support.hp.com/us-en/product/HP-Pavilion-p2-Desktop-PC-series/5187034/model/5226106/document/...

This is your only option if you didn't make the media when you bought the computer.

Please click the Thumbs up + button if I have helped you and click Accept as Solution if your problem is solved.

[zamks]

i really appreciate your help
but i need a big explaination because i dont know how to go to USB to install windows 7 and i dont know wish recovery or programe do i need

[old_geekster · Accepted solution]

You are welcome, @zamks.

You will have to have the model & serial number for the computer to order the Recovery media.  Here is a link to help you find them:

http://support.hp.com/us-en/document/bph07555

I beleive that you can buy the Recovery disks so you don't have to use USB.  If you still are having problems, I suggest that you get help from someone who can help you locally.