Sometimes you want to edit a file and you are unable to because someone else is using it at the time. Windows will tell you most of the time who's using it. 

But what if the person is no longer using it and you are still unable to edit the file? Reboot? Not just yet, you can also solve it by using Sysinernals Process Explorer. 

Here's what to do:
- Open Sysinternals Process Explorer (You can download it from here)
- Click on View> Show Lower Pane (Ctrl+D will do this)
- Select the Handles option from the View> Lower Pane View (Ctrl+H will do this)
- Go to Find> Find Handle or DLL (Ctrl+F will do this)
- Type the file name and click Search
- Your file will appear on the lower part highlighted. Double click it.
- On the lower pane now you see the handle being highlighted. 
- Right-click the File that is being highlighted and select Close Handle. 
- This will now Close whatever was still holding onto the file and you'll be able to open you file without an issue. 

And that my friends is how you do it!