I think you are going to have to find someone local who can reinstall that for you. Unless you have a Win 7 disk you are not going to get very far. You can get an ISO for Windows 7 but you will need to know the Windows 7 product number and if that computer has EUFI bios that isn't easy to get. In the old days the product number was on a greeny blue Microsoft sticker on the bottom of the computer or inside the battery compartment.
To download the Win 7 ISO you can go here:-
https://www.microsoft.com/en-gb/software-download/windows7
Again I have to say that if you do not understand what we are trying to tell you then, I'm afraid you are not going to get very far.
There is a tutorial here if it helps:-
How To Clean Install Windows 7 [Complete Walkthrough]
To download the Win 7 ISO you can go here:-
https://www.microsoft.com/en-gb/software-download/windows7
Again I have to say that if you do not understand what we are trying to tell you then, I'm afraid you are not going to get very far.
There is a tutorial here if it helps:-
How To Clean Install Windows 7 [Complete Walkthrough]