Please do as follows to completely uninstall HistoryKill 2005 and reinstall the updated version to fix this known issue:
Step1: shutdown both HistoryKill and HK PopUp Killer (right-click on
both icons on lower right corner of the monitor, then choose Shutdown
options) ---> say Yes to the messages.
Step2: click Start button on Windows taskbar ---> go to Programs
---> locate HistoryKill folder ---> choose Uninstall HistoryKill.
Step3: visit http://www.trustsoft.com/support_files/HistoryKill2005Update.exe to download and reinstall updated HistoryKill 2005.