Problems updating steam platform
By 2019, the service had over a billion registered accounts with 90 million monthly active users.The success of the Steam platform has led to the development of a line of Steam Machine microconsoles, which include the Steam OS operating system and Steam Controllers, and the Steam VR platform.This validation, I concluded, was just a sanity check to be sure that the unexpected killing of Steam didn't corrupt any of its files.
Another thing that is mentioned in the Steam forums, is allowing Steam to verify all of its files and then closing Steam properly (rather than letting Windows kill it as it shuts down).
This will prevent the update script from running and skip to starting Steam straight away.
Note, you'll need to do this once for each install path of steam (for those who have multiple Steam installations).
What you'd do here is wait however long it normally takes to verify files and get into the main Steam interface, and then close Steam with the menu option (or system tray icon) before restarting it.
After restarting in this manner, the file verification window shouldn't appear, since Steam would have properly closed all of its files when it exited.