Whenever I use any USB memory stick with a computer running Windows Vista and I'm finished, I click on the Safely Remove Hardware icon to stop using it. I get a message saying that Windows cannot stop because the device is still in use, and to clase all applications. But all applications are already closed. The Task Manager shows no applications are open. I tried running a small program called "handle" to show any handles connecting to the USB drive, and it shows no handles. I've disabled Indexing Service just in case it was that. It still won't allow me to disconnect. It doesn't matter what memory stick I use, and all of these memory sticks will work fine and disconnect fine using the Safely Remove Hardware icon on computers with XP and Win2000. So to disconnect on the Vista computer I have to shut it down. What is going on?