If you are a pirated player: 1, you are playing piracy. It's a version cracked from the internet, and this will happen without steam as a carrier. 2, the running environment is not perfect, because the pirated version you downloaded will not be finished like the genuine version in steam, and some necessary things will be installed for you. Ps: It's very cheap to buy it in the game steam. If you buy a genuine player, there will be no problem. Compatible with xp, the running environment required by win78 10 will be installed for you after you download it with steam.