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 iSpQ VideoChat 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 iSpQ VideoChat application and click on Uninstall.
On Mac you only need to drag icon of the program to the Trash.