Hello my name is***** look forward to assisting and am very sorry to hear that you are having this problem.
I assume you mean from windows 10 if not let me know. You should see a box that says search web and windows.
Click on that and type in reset. Click on reset this pc in the list.
Now under go back to windows 7 click on get started.
If this did not work, please come back and let me know what happened when you tried it by clicking on reply to expert so we can continue.If it did work, please don’t forget to leave a positive rating - it is greatly appreciated.