This happened to me as well...
"My hard drive has a capacity of 105 GB, (though it was supposed to have 120
GB...it always ends up like that when formatted) and has about 10 GB free.
(This is shown by looking at the status of the Drive in the drive's
properties window.) Therefore, there should be about 95 GB used in the
system. However, I opened the hard drive folder and added up the sizes of
all the folders there (Program Files, Windows, Users, etc.) and it came up
with only about 88 GB used. Therefore, it should come up as about 17 GB
free...what is accounting for this 7 GB discrepancy. I could imagine some
miscalculation errors accounting for a small amount of difference, but 7
Gigabytes is a bit too much...what's going on?"
I upgraded my laptop from XP to Vista, which was probably a bad
idea...should I just wipe the Hard Drive and do a clean install as well?