Christopher Cobitz in the Department of Curriculum and Instruction at the North Carolina Agricultural and Technical University developed this site. Teachers-Education Technology Initiative from Western Carolina University is chock full of helpful information. Some information is specifically for use on their network, but lots of great information and ideas. Basics Complete computer operation basics for both platforms. Click on the skill you need to review and follow the instructions.
Some links contain movies to illustrate the concept.
Microsoft Word tutorial, by skill, is online too. PowerPoint can be self-taught too if you follow this link to WCU's tutorial. 95 links abound here. Check out the complete list.