QuickHelp utilized icons in several different locations to indicate a users calendar, tasks, notifications, among others.
These "icons" are actually fonts, so if they aren't displaying correctly (see below), it could be that your IE browser settings aren't configured to download fonts.
To change this setting, go to Internet Options > Security > Internet | Local Intranet | or Trusted Sites > Custom Level
Find Downloads > Font Download
Enable, and OK through all dialog windows. This may require you reboot your browser.