I have XP home with 27g of usable space. Right now, I have only 590mb free, but I've tallied all the programs/files that would take a lot of space and it only adds up to 23g max. How can I find out how the rest of disk space is taken up? I've cleared unused programs, cache, etc. Is there a way to seeing a breakdown of disk space? I tried to defragment, but it needs 15% free space and I only have 2% - it's a catch22 really.