I will throw some things out while fresh in my mind, do you run BB as Administrator, did you try it in RealBand.
I'm trying to remember something like this happening before to someone, maybe have a look back thru the UserTracks forum.
It's trying to access the files on an external drive F:\ is BB running from this drive or Laptop C:\ ?
If BB is on C:\ you can try copy the usertrack to c:\bb\RealTracks\UserTracks then set BB to that RealTrack folder just to try.