Media
Here are some videos, which should help you better understand your computer better.
Anatomy of a Computer
This is a video giving a basic rundown of what's inside a computer, and what each part does.
File Fragmentation
This is an old video which came with Norton Systemworks back in 2000, but still accurately explains what file fragmentation is, and why it's so important to defragment your hard drive.
Optical Drives
This is how you CD, DVD and Blu-Ray players work.
Internet
How the Internet works.