This laptop is very problematic to install windows 7. You may encounter anything from touchpad not working in windows 7, some drivers missing or BSOD because of incompatible drivers.
Your windows7 is probably stuck because of incompatible drivers. The hardware in this laptop was made and chosen with Windows 10 in mind. ASUS gives no support or drivers for Windows 7.
You'd better install Windows 10 if you lack expertise and don't want to spend days figuring out how to make everything work (no guarantee it will).