Recent Websites Not Erased IE7 + Firefox

I have searched documentation and FAQs and can't resolve an issue that seems pretty basic. When I run CCleaner, it does not erase the history of recently visited websites in IE7 or Firefox. I have checked off everything in the program's "Windows" and "Applications" tabs including "Custom Files and Folders". Other items, like temp internet files + cookies seem to be deleted correctly.

Any suggestions appreciated.