The log crawler pauses at "Firefox/Mozilla Internet History" when this error occurs, requiring the user to click OK in the error dialog box to continue on. Continuing is uneventful.
then your firefox is not entirely closing (something perhaps a add-on is stopping firefox's processes from completely stopping
try this before running ccleaner exit firefox (from within firefox)
then open task manager
go to the second section (background processes) of the first tab (processes) and look for Firefox.exe or plugincontainer.exe also be sure that any Mozilla based product is completely closed
now try running ccleaner
I have asked a Administrator to change your username as using your email address as a username (or in a post) will attract spam to yourself and the forum. I've asked for them to shave everything after and including the @ symbol)