You can use a free utility software known as Free make video converter to join video clips together into one.
You can go to this site http://www.freemake.com/free_video_converter/
Download it and install it.
Run the program.
After that select the Video clips you want o join by pressing “Ctrl + A”
Now drag the button as shown in the picture to the right to join the clips.
Now you can select the format or the device for which you want to join video clips together from the bottom.
Now you will get the setting box for AVI format.
You can also select the location where you want to save the joined file.
At last click on “Convert” button.
This is how you can join video clips together into one.