There are times when working under Windows when you may notice a couple of different errors pertaining to files or resources being in use. You may see it while trying to access new files, or maybe while trying to remove unnecessary applications. If you’ve ever gotten one of these errors, check out Unlocker. Unlocker adds itself as a Windows shell extension so you can right-click a file and select Unlocker to kill the process. It’s all free, and all Windows.