If you want to create a video but you have no powerful video editing software, you could use windows movie maker that is built within your windows operating system (if you are using windows OS) Below are 2 links: one is basic and the other is advance. enjoy!

Ayumilove Windows Movie maker Part 1
http://www.youtube.com/watch?v=aI-dhd_eHXs

Ayumilove windows movie maker part 2
http://www.youtube.com/watch?v=sBAxkFFW4zw