I had to format my pc, so i copied all my games from steam->steamapps-> common, i copied the common folder in which the games are present, so after reinstalling the OS, i installed steam nd copied back the common folder with games in it. Inside the steamapps. And logged in, in steam, it starts to download the whole game again. i dn't wanna download again, it's a huge amount of data, with my internet it gonna take weeks. somebody help. apologies for the bad english.