SpeedDisk Service Problems on Shutdown

I am having problems when shutting down Windows Vista, it never finishes so I am forced to turn off the laptop. After investigation in the Event Viewer, it is the SpeedDisk service that is not shutting down when requested.

 

 

So i have to shutdown the real time defrag to allow the system to shutdown properly.

 

Anyway I could fix this?

 

Regards.