Strange loss of free disk space

[Mok-Kong Shen]

Hello,

Using the command "dir /a:-d /s", I obtained for the diverse
subdirectories of c:\ the number of files, the sum of occupied
spaces in the subdirectory and the current free disk space of
in C:\ on two different days. I found that, excepting
three subdirectories, there was no change at all of occupied
spaces. (I have no access to c:\System Volume Information.)
The results are as follows:

C:\Dokumente und Einstellungen (German name)
Time No. files Occupied space Free disk space
20.9 21:55 7729 1.586.778.619 225.783.951.360
28.9 00:40 7706 1.591.040.390 225.675.317.248

c:\Programme
Time No. files Occupied space Free disk space
20.9 22:13 59697 4.204.447.920 225.783.889.920
28.9 00:42 59697 4.197.722.646 225.675.313.152

c:\WINDOWS
Time No. files Occupied space Free disk space
20.9 22:33 35592 5.921.921.432 225.783.889.920
28.9 00:45 35662 5.931.471.974 225.675.313.152

It is obvious that the reduction of free disk space cannot
be explained by the increase of occupied spaces. The total
increase of occupied space is about 7 MB, while the loss of
free disk space in the same time period is more than 108 MB!

What could be the cause of that?

Thanks.

Mok-Kong