Here is what to do on any working computer you can access. That computer will need to be able to access the Internet and be able to burn a DVD (DVD burner required).
1. On a working computer, open a web browser and go to this web address:
2. It will prompt you to download a file named MediaCreationTool. It is used to download the Windows 10 image file that you can burn onto a blank DVD
3. Run the downloaded tool and select the Create installation media for another PC option and click Next. Un-check the check-box at the bottom and select the same Windows 10 version that is installed on your computer, and click Next. "Windows 10" refers to the Windows 10 Home edition, and "Windows 10 Pro" refers to the Windows 10 Professional edition
4. You will then be able to choose between creating a bootable USB flash drive or a bootable disc (ISO file). My recommendation is to go with the bootable disc so that you can always have your own Windows 10 disc when needed. So, choose the ISO file option and click Next
5. Select where to store the Windows 10 ISO file and let it download. It will take some time for it to finish downloading since the file is about 2.5 GB in size
6. When done, you will need to burn the downloaded ISO file onto a blank DVD disc (not CD, but DVD). To do that, you can use a free program named Free ISO Burner which you can download on this link:
7. Start Free ISO Burner and insert a blank DVD. Click Open and locate the ISO file you downloaded using the media creation tool and then click Burn
8. After you have burned the disc, eject it and insert it into your computer
9. Restart your computer and it should then load the Windows 10 setup from the disc. If not, you will need to access the BIOS and set booting from the CD/DVD drive
10. At the Windows Setup screen, you will then be given a way to (re)install Windows 10, or to repair it. Select "Repair your computer" option located in the bottom left corner
11. The "Choose an option" screen will appear. On that screen, click on "Troubleshoot", and then click on "Advanced options"
12. On the "Advanced options" window, click on "System Restore". Click on "Windows 10"
13. The System Restore window will open. Click Next to see available restore points. Select the one that was created before your computer encountered the problem. Click Next and then Finish to start the restoration process, which usually takes several minutes. When done, your computer will restart and should boot to Windows 10 as before. Note that System Restore won't delete or restore any personal files. Only Windows and program settings are affected
Hopefully, that will help solve the problem.
You can print these instructions and follow them on another computer. If you encounter problem, or if System Restore didn't work, let me know and I will provide another way of repairing the problem using a Windows 10 disc.