have a look at these screen shots...
Trying to free up space on the 40GB drive, user has about 8GB of personal files...
The rest is supposedly in C:\Windows
(Ran diskcleanup/ccleaner, turned off Sys restore)
Ran CHKDSK /F ; Defraged ;
Ran Full AVG scans; Ran Full Adaware Scans
Went through Add/Remove programs and cleaned anything un-needed out (largest program installed was office pro 2003)
searched for files larger than 150MB and it returned 1 outlook .pst file
Still digging, helps appreciated