What computer operating system?
Have you updated 13 to 13.1 using an opened project's Help Menu/Updates. If not, please do so.
After that, if the internal microphone is not recognized by the Premiere Elements 13/13.1 Narration Tool, I would check the Edit Menu/Preferences/Audio Hardware and its ASIO, followed by, if indicated, an uninstall, free ccleaner run through (regular and registry cleaner parts), reinstall with antivirus and firewall(s) disabled. If Windows.....CCleaner - PC Optimization and Cleaning - Free Download
Please supply more details.