Hi, I upgraded to El Capitan and was left with a folder called ‘Previous System’ in the root of my SSD. I deleted and emptied the trash but was left with a vm folder with a locked 'sleepimage’ file inside. Dragged it to my desktop and tried to unlock but couldn’t. Now I can’t delete immediately or even move to trash it. It’s 0kb in size. I’ve restarted but still no luck. Anyone know the solution to this? Thanks.