You have definitely thought about this

The system will let you go to the desktop, but you will not be able to interact with its elements and files. In the best case, it will be possible to copy the most important to a USB flash drive. System Restore will not help - it will simply refuse to start. The only way to get your computer back up and running is to reinstall Windows (and lose all your files).

It is strange that with such introductory Microsoft has not yet begun to sell branded UPS.