Freeing up disk space xp 100 gigs

I have an 8 gig back-up drive in my HP desktop and a 172 gig C: drive. I did a search of my hard drive and could only find abou5 40 gigs worth of space, but the PC says my C: drive has only 10% space remaining. I am beside myself trying to find the missing 100 plus gigs of wasted space. Can you help me? Thanks...
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  1. Seems your numbers don't add up. If you have 10% left doesn't that mean you 20GB left? What do you mean by the missing 100GB of space?
  2. download > run > and post the results of TreeSize, it'll tell you where the space is being taken up:
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