Steam games not validating
Namely, while some players (like me) enjoy great gaming experience in Steam, others can’t even start a game.
Steam is generally pretty stable, but every now and then you’ll run into a problem.
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Steam will examine the game’s files and – if any problems are detected – will re-download the corrupted files from Steam’s servers.
Additionally, you can try to manually install Direct-X. It should look something like this: D:\Steam\steamapps\common\Orcs Must Die 2\installer Find the file called "DXSETUP.exe" and double-click it to run the installer.
After it's completed, restart your PC and relaunch the game to see if that fixed the issue.
Steam support suggested it once and it got me out of a problem I had, so I try it again on occasion.
It appears to compare checksums of your local files with the cloud and will re-download any invalid files again.
Search for steam games not validating:
To validate a game’s cache, right-click the game in your Steam library and select Properties.