Here are some Videos that can help you learn to use a computer if you are a complete beginner.
I have sometimes put more than one video for each subject, this is because some videos are better than others and also because it can be of benefit to see an item described different ways.
How to Use a Mouse / When to use Single Click vs. Double Click
When to use the left or right click https://www.youtube.com/watch?v=8sSjWE2fLsE
This is a Google Hangout on Air describing types of computers in quite a bit of detail. It run for 13 Minutes but only the first 7 are about types of computers. The rest gives you an appreciation of what google hangout is all about (Another way to learn)
This video also explains input processing and output
This video start with various parts of the computer but spends quite some time on the various part of the keyboard
This is a keyboard lesson video, but it only tells you what to do but does not show any examples of doing it.
This video goes into a bit more detail as to the types of software
This one gets a bit technical and uses a lot of bus words
Maximize Minimize Restore and Resize Windows
The first 4 minutes are within a a document and the rest of the video is on cutting copying and pasting files
Explains the difference between Menus in Windows XP and the Ribbon in Windows 7,but goes on a bit
This Video only shows hor to record sounds, Not to play them. You should be able to play the souds you recorded by double clicking in the file where you save the sound.
A very good explanation done by Josh (an Aussie)