Validating steam cache files
Disable these third party applications from the task manager and launch Steam again.
It is a well-known fact that Steam conflicts with the Windows Firewall.
In many cases, the installed mods for a game may conflict with your Steam client and cause you unexpected errors.
Like the error states, it found something that it shouldn’t or the mods caused a file to be changed.
Steam is one of the most popular gaming distribution platforms in the world.
It has more than 30 million users which are active. The first game which required a Steam client was Counter Strike 1.6.
If not, you should try running the verification check again.
Another remedy is to open the game you are playing directly from its installation folder. All the games that you install are independent applications present with their executable present in the local files. If there is still an error, you can proceed with the other solutions listed below.
It may be the case where Steam downloaded and installed an update.
Your game may be installed in a drive which contains bad sectors. Follow the steps below to ensure using the utility chkdsk. It checks for any errors present on your drive and tries to correct them using the resources available.
It is very useful in troubleshooting for errors that we can’t pinpoint.