Hi there. I have 37 gb space in local disc. I downloaded a game, then i got 26gb free space. Then, i deleted this game, and i still have onley 26gb free space left! What?
Please, answer, thanks

Very likely the file is still on the drive, but now moved to Recycle Bin..... Try emptying your Recycle Bin.

BTW 10GB is one very big game!!!!!!

I presume you uninstalled the Game. Typically the Downloaded game file is pretty large and if you haven't deleted it, it could responsible for the reduction of free space. Delete it. Also check your TEMP file. the install process could have expanded the program into a temp file for installation, and some improperly designed programs do not eliminate this data