Windows Live Movie Maker
The first tutorial shows how to download and install Windows Live Movie Maker and get started with basic editing. The 2nd video continues with basic editing and helps with uploading to YouTube. The tutor also provides some really good video editing tips at his site, http://icreatevideo.com/
The remaining tutorials show various features of WLMM. If you already have it installed on your computer, you can probably just jump ahead to these.