How do you show freed hdd space

I was getting low on hdd space, so I moved about 25GB of files to a backup drive, but my hdd doesn't show the freed space. I know in newer versions of Windows it does it automatically. How do I fix this in XP?
 
what does it show in disk management?
have you run a defragmentor?

if you go to my computer and hover over local disk it will show free space in a balloon tip
 
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