If you use Windows XP or bellow you can go to Start > Control Panel > Add or Remove Programs. In the Currently installed programs box, click on the Xilisoft Video Cutter program and then click Remove.
If you have Windows Vista or above you need to go to Start > Control Panel > Programs > Programs and Features. Select the Xilisoft Video Cutter application and click on Uninstall.
If you're using a Mac, drag the program icon to the Trash.