Camtasia is a desktop video application that allows people to record through their webcam and take screenshots of their computer display. If you are upgrading your Camtasia software or switching to a different program, you can delete the old software from your registry with the Registry Editor. The Registry Editor allows you to delete all of the contents of a software package if it doesn't came with an uninstall application.
Click the "Start" button on the lower left hand side of your screen, and then click the "Run" bar. Type "regedit" into the "Run" bar. Press the "Enter" button to open the "Registry Editor."
Click on the "HKEY_CURRENT_USER" key on the left side of the screen. Click on the "System" key followed by the "Programs" key.
Locate the "Camtasia" entry in the "Programs" menu, and then right-click on it.
Select the "Delete" button from the menu that appears. Click the "Yes" button to confirm that you want to delete the entry.
Click the "X" button on the top of the software menu to exit the "Registry Editor."