Create Windows 10 installation media
Click on Download Tool Now
Save and then right click and Run As Admin
You want to use the tool to create a bootable USB drive following the instructions under:
Once you get it made then you stick it in the sick PC and boot off it. (You may need to change the boot order to have it look at the USB before the hard drive. That's usually done in the BIOS/CMOS setup which you get to on a Toshiba Satellite by pressing F2 about the time you see the Toshiba logo during a boot.)
Once you get it to boot
When you see the Install Windows page, tap or click Repair your computer to start the Windows Recovery Environment.
In the Windows Recovery Environment, on the Choose an option screen, tap or click Troubleshoot.
Tap or click, advanced options and then click on Startup repair.