I recently moved a folder 219gig from one hard drive to another and everything was fine. No problem. But now it decides not to open. This on windows 8.1 64bit. I click the folder but it just gives that swirling icon forever. When I click the x to close it tells me not responding. I managed to copy it to another drive but same problem. I've checked the drive and no errors. I just don't know how it's became corrupt or what's happened? Any good utils I can use?