Deinstall a App is easy.
At first you shout stop the App. Use the Taskmanager to kill the complet programm of the App.
Then you only remove the Folder from the App.
But if you installed the App with a installer, you shout use the Deinstaller of the App or go to the Systemcontrol of Windows.
Restart your system and the App shout be gone!
If you like to instll Apps, read this.