So the hard drive is 120GB, and you have about 111GB drive? You have used, 30-40 GB, and have 70GB free, bearing in mind, you always lose about 10GB with a 120GB drive.
With a 40 you lose, about 3 GB, 80 - 6Gb, and so on. So im still really left wondering whats the problem, how much free space does it say you have, how much does it say you have used, and how much is the capacity that windows tells you.
Its all in the properties of C when you right click the c drive in my computer
Windows Loaded .... System In Danger.
Keyboard Not Found .... Press F9 To Continue.