I have been unable to successfully erase the unused disk space. I downloaded the 18.104.22.16820 version of eraser. I keep on getting the error message "Eraser has encountered a problem and needs to close". The last time it occurred, I was able to get this info re: the error message "EventType:clr20r3 P1: eraser exe P2: 6.09.2620 P3:4fbad9e6 P4: eraser.util P5: 6.09.2620 P6:4fbad9d5 P7: 62 P8:9 P9: system.nullreferenceexception . However, I was unable to right click on the task - the page disappeared. I tried to install the update and that did not work. I am now defragging my computer. Is there a solution to this problem?