M3tag open message.

ihave mp3tag version 2.66. my system is vista. I have used mp3tag for a while now with no problems. When using it yesterday it got completely clogged and my mini-sd was also corrupted.
Clicking on the logo now does nothing. I have tried to uninstall but it aborts with message 'Mp3tag is open, please close' and then the uninstall aborts. It does the same if i try to download an updated version. Problem is , the mp3tag is closed as far as i can see. !! any ideas as to how to proceed

On a corrupted system anything can be the cause.
If MP3tag is reported by the OS to be still running, then check the Task Manager and have it display all processes by all users.
Force any MP3tag process to terminate and try again the installation.