How do I erase items off of my hard drive if its not there

my dad recently reformatted my computer and used windows xp recovey disk to reinstal. everything worked fine other than the hard drive is full. i cant find any of the items to delete them. all of these items were previously on this computer movies, music, games and on.
 
If the drive was really formatted then it shouldn't be full after an install of XP. Is there more than one drive in the system. What size is the boot drive, how many partitions are there?
 
You could try a live Linux cd, such as knoppix, to see the partitions, and also the 'hidden' stuff, if any.
 
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