Thank you for your reply. You are absolutely right. I switched off Vista's System Restore and the missing 35GB I was chasing were recovered instantly. Eraser had been working perfectly all along. The issue was with Windows.
I have been using the last 4 versions of Eraser, but have noticed this problem only on the last 2 versions I have used, 5.86.1 and 5.84.
I have noticed that sometimes when I erase a large folder, the files it contains disappear from Windows explorer, and the erase report...