OK, so to achieve Safe Mode, use a Windows Recovery Disc (you may have made one when you first had the Laptop). If you have a Windows 10 CD/DVD you could repair Windows using that, if not access to another PC:
https://www.microsoft.com/en-gb/software-download/windows10
By the way, if your Laptop is still under warranty, tell the Vendor that if they cannot restore it, the should replace it.... 
....it's always a good idea to have a USB drive to backup your data and software. I simply copy the entire drive (Macrium Reflect). Needed the backup several times over the years.