Laptop showing ArmA setup error while opening a game

My son tried to play one of his games on his laptop and an error appeared. I have to mentions that he plays this game every day and until now it never happened again. A window showing the following message appeared, and since then he cannot open his game. Why did this happen?
ArmA setup
Unable to find setup01.bin.
Please keep setup.exe and all *.bin files at the same directory.
OK
