Free courses for computer beginners from the BBC. Work through them online at your own pace.
Example courses:
The WebWise Online Course:
A step by step guide to using the internet, email and mobile devices
Internet Basics:
An introductory video guide to getting online
Computer Basics:
Follow the video guide and get to know your computer
Your computer
An introduction to the basics of how to use a computer
Using the web
Advice and guides to help you get kick-started online
Safety & privacy
Protect yourself and keep your computer safe from harm