my internal drive corrupted and my backups weren't completely up to date so I had to install a few different programs back on my UMBP. I went to try to install parallels, and windows but had forgot that the original box's/cases/info were left in a car which was subsequently in an accident/totalled. It's not the biggest of losses, but I tried using appcleaner to get rid of the already installed portions of Parallels which worked ok. I then tried to empty the trash bin and it keeps on saying the DMG is in use and cannot be deleted. I have looked through apps/mounted img's/info and don't see the file anywhere but in the trash. What should I do next in order to remove this file?