Unable to validate game files

"Unable to vaildate the game files"

This message keeps popping out recently, it says 'unable to validate game files'...

This is kind of strange problem, because I DO have a game files... all downloaded that needs to progress the game;;;

I run a game scan several times to solve this... sometimes it worked, but as this problem keep continuing, it happens to fail more than suceess that I had to re-install again....(but appear again even I do so)

What might be the problem that cause this situation???

 

Thanks for lending a help. I re-re-installed again and it seems it's working normally. However, there is a chance that the message will pop out in future again, I'll text a message when this happens again one more time.

By the way, what is IP? Where can I find IP at my computer?