Kubuntu 8.04 KDE4 Storage Problem

[Steven Vollom]

On a 200gb hard drive, I show 56gb unused space.  I was downloading from 
Ktorrent and it stopped with a warning that drive space was low.  I 
removed an additional 20gb of data (some movies I didn't want anymore) 
and still it showed out of disk space.  I rebooted to see if that would 
make a difference, but it remained with low disk space.  I am able to 
use the files and the operating system is not crashed.  Has anyone had 
this problem?
Steven