The problem has returned and Eraser 126.96.36.19920 crashes when laucnhed. So deleted "tasklist" from "\Local Settings\Application Data\Eraser 6", deleted Eraser registry keys, repaired Microsoft Net 3.5 SP1 and Microsoft Net 4, rebooted, reinstalled, all to no avail. Any other suggestions anybody?Problem solved! Microsoft Net 3.5 SP1 was corrupted. Repaired via Control Panel, Add or Remove Programs and Eraser now working ok.