The files that you installed by following the tutorial can be uninstalled in an easy way. Follow the these steps to uninstall the files:

1. Open the Control panel in Windows.
2. Choose Uninstall a program.
3. Double-click on "My First Project" (see the picture below):
   

 
4. Follow the instructions that the uninstallation program gives you.
5. Now are the files uninstalled!