Do you know a free video-making program for Youtube?

You can start a high-def. video editing program way more cool than windows movie maker but has the same controls and its user friendly. The program is called “Power-Director” It is video editing software published by the CyberLink Corporation. The program allows users to capture, edit and output from within the software and has semi-professional features suitable for the consumer level. Its main competitors are Adobe Premiere Pro and Elements, AVS Video Editor, Ulead VideoStudio, Pinnacle Studio,and Sony Vegas Movie Studio.

VirtualDub. It's free and - imo - still the best freeware for video editing. You may need to download additional filters, codecs etc (which are also free) though. And if you're willing to learn a script language called AviSynth your possibilities with VirtualDub will further increase.