My favorite computer utility is and has always been, the VLC Media Player. I’ve never had a single problem with it running on any of my computers, and it is a quality product (also free). I use a Sony VAIO computer, with a Windows 7 OS. The VLC Media Player is fast, not glitchy, and am able to watch any movie I want on it, including movies on external drives. I have no complaints with this product at all.