The Windows 10 iso from Microsoft will format the flash drive before it installs the iso files.
There is typically no need for Rufus or any other third party software to prepare the flash drive.
Allow the download to prepare the flash drive.
See this tutorial:
https://www.tenforums.com/tutorials/9230-download-windows-10-iso-file.html
https://www.microsoft.com/en-us/software-download/windows10
For the problems after an update consider opening a new thread once you have the iso.
Often important files can be backed up to another disk drive or the cloud.
If troubleshooting works then you are set.
If troubleshooting fails then you can often custom or clean install.
(custom install saves files and reinstalls a new operating system)
.
.
.
.
.
Please remember to vote and to mark the replies as answers if they help.
On the bottom of each post there is:
Propose as answer = answered the question
On the left side of each post: Vote = a helpful post
.
.
.
.
.