Computers - how do they work?

Hard drive, memory, processor, motherboard, operating system.

Windows - how to manage your system?

Control Panel
Installing & uninstalling programs
Changing your background
Changing your internet settings (homepage, search engine, tabs)

Housekeeping

Disk Cleanup
Defragmenting
Internet Cache cleanup
Preventing unwanted addons from being installed when installing a program/update
Windows update

Security

Antivirus, Antispyware, Antimalware, Antispam, etc (concepts)
Reasons for malware (money)
Firewall - what to do when your firewall notifies you that a program is trying to access the internet (or access your computer). Windows firewalls. The Windows Security Centre.

Basic Networking

Your computer and it's link to the internet
The router - what does it do? Manage the connections between computers and the internet. Each computer is assigned an address by the router called an IP address. The router then recognises which requests come from which computers and manages them accordingly.
What is a modem? Like a radio, it picks up the broadband signal and translates it into code which is understood by a computer.
What is wireless? How does it work?

The Internet

What is it?
Where is it?
Who created it?
Why does it get slow?
How do the broadband providers connect you to it?
What is a website?
What are the threats on the internet?
What is web2.0
What is HTTP?
What is cloud computing?
What's next for the internet?