Dead Space 3 Double Download

Hi,

When I downloaded Dead Space 3 yesterday, it worked perfectly. I launched it to make sure it worked, and I configured my settings to my liking so I could play it the day after. But I woke up today to see it wanted me to download the WHOLE thing again. It didn't even give me my hard-drive space back. I can't find the DS3 folder anywhere in my C: drive and I am extremely confused. It took me about two hours to download it yesterday, and I'm happy to do that again. I just want to know if there is a solution to either play the game immediately because I HAVE downloaded it already, or to somehow get the hard drive space it took up back.