Cannot see what is taking up disk space

Question

On my Lenovo 3000 N200 with Vista Home basic, C: (using property) is showing 101G used 4.2 G free, but when I add up the size of the folders under C:, they only add up to 20G.  I understand there is a service partition that is invisible, and this is around 20G.  But where is the other 80G ? Help !
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Answer 1

Use caution with any of these ideas, your system may be set up differently!!
Before you start deleting things, determine what exactly is taking up the space.
1. Could be Lenovos Rescue and Recovery backup files,
I think these can be deleted through the program. I do not use it,
so can not tell you how.
2. Or maybe Vistas windows restore files and shadowstorage.
Try disk cleanup, part of vista? Delete restore files, and then create
a new restore point.
3. I have used this command from a command prompt window,
right click, run as administrator. Website Link with explanation;
vssadmin resize shadowstorage /For=C: /On=C: /MaxSize=4GB
maxsize can be changed.
Type  vssadmin /?  for parameters.
EDIT: Changed the command syntax.