Windows 10 won't let me login to my computer

Hello,

Thank you for posting your question on Microsoft community.=

This issue may occur due to corrupt Windows startup files.

I would suggest you to run startup repair and check if it helps. You may need to connect an external keyboard to perform it. Please follow these steps:

a. Do one of the following, depending on whether you have installation media (such as a DVD or USB flash drive):

- If you have installation media for Windows, start your computer from the installation media. Insert the DVD or USB flash drive and restart your computer. If you see a message asking you to "Press any key to boot from DVD or USB", do so. If you don’t see the message, you might need to change the boot order in your computer's BIOS settings so that it first starts from the DVD or USB. When you see the "Install Windows" page, click "Repair your computer" to start the Windows recovery environment.

- If you don’t have installation media, use the power button to restart your computer three times. This will start the Windows recovery environment.

b. In the Windows recovery environment, on the "Choose an option" screen, click "Troubleshoot".

c. Click "Advanced options" and then click "Startup Repair".

Note: Modifying BIOS/ complementary metal oxide semiconductor (CMOS) settings incorrectly can cause serious problems that may prevent your computer from booting properly. Microsoft cannot guarantee that any problems resulting from the configuring of BIOS/CMOS settings can be solved. Modifications of the settings are at your own risk.

You may download Windows 10 ISO files and create a Windows bootable media or DVD.
Refer this link:
https://www.microsoft.com/en-us/software-download/windows10

I hope this information helps.

Please do let us know if you need any further assistance.

Thank you.