I'm running Windows XP and have about a 75 GB hard drive. When I check the properties of the c drive, it tells me that I have 48.5 GB of used space. I have moved all major files (music, video, pics) to an external hard drive, but there's still a ton of used space. I have run disk cleanups, chkdsk, defrag, and cleaned up the registry. The last thing that I've done is run jdiskreport of the c drive and it tells me it's only using 15.5 GB. Where is the rest of the stuff?