What format is your video recorded in? .wmv, .avi, .mov, Mp4? The two best uploading formats are the wmv and avi. You can tell the format by looking at the file. It should say something like file0001.wmv or file0002.avi. You-tube does not like.mov (quicktime files).
If your camera uses mov or DVD, you will have to find a converter to change it to an acceptable You-tube format. Let me know what you have and I might be able to direct you to the right software.