What computer operating system?
Make sure that you have the latest version of QuickTime installed and your are running the programs as administrator and with an active Internet connection.
Uninstall Premiere Elements 13 from your computer
Do a free ccleaner run through (regular and registry cleaner parts) - assuming Windows for now
Reinstall the program from the following installation files and insert your purchased serial number in them during installation. Be sure to disable antivirus and firewalls for the download and install of the program.
Let us start here and then decide what next based on the details in your reply.