idle time scan and optical drives

I am using NAV 2009 and the "idle time scan" automatically scans my C: drive (only hard drive) and my DVD ROM drive.  I leave a game disc in the DVD ROM drive all the time so I can jump in and out of my current game whenever.  The "full system scan" that is performed during idle time takes a very long time because it is scanning that game disc as well.  Is there a way to configure the automatic "idle time scan" to just scan my C: drive.

 

Thank You