Steam keeps validating game files
) This happened when I was trying to make Portal 2 and Stanley pabs together and I deleted some files accidentally.
What happens is that it checks the games has all the proper files (sometimes if you want to mess with maps and stuff might accidentally delete some stuff so it adds all the right files!
Do not run the verification process while performing other system-intensive processes, such as defragmenting your hard drive or scanning for viruses.
Do not run this process for multiple games at the same time.
I recently posted this to the Steam Community, thinking that was a more appropriate place for it..they were useless (see for yourself), and I've always gotten better answers from Tom's users, so I'm hoping someone might have some insight into this.
I've run into an issue where when I run "Verify integrity of game cache" it ALWAYS finds files to validate.