Canon Powershot sx120 ... I have sound on my camera when I playback a movie, but not on the computer. Is there a setting I need to use that would transfer the sound as well?

SOURCE: Choppy playback on computer.

. this usually happens if your computer is not updated with the required codecs...

please try to install k-lite mega codec pack.

hope this works.

SOURCE: Canon PowerShot SD 870 IS Movie playback speed is too fast!

You've got it on Time Lapse video. Turn on, slide to video, press func. set button, toggle to standard instead of time lapse. Maybe next time try your owners manual. Of course you all are probably like my mom and just get a new camera, put in the batteries and start taking pictures. These stupid expensive cameras have too many options and get messed up too easily with the wrong press of the button. Try a simple cheap on next time.

SOURCE: how to transfer pictures from my Canon PowerShot

There are two ways of doing this:

1. Install the software on the CD that came with the camera, then use the USB cable that came with the camera to connect it to the computer. The software should walk you through the rest of the process.
2. Buy an SD card reader (example Card Reader from Amazon.com), connect it to your computer, and take out the SD memory card from the camera, and insert it into the appropriate card slot on the card reader. Then use whatever photo management software to manage your photos.

SOURCE: lens error, restart camera for canon power shot SX120 IS

This is probably THE most common failure among digital cameras. There's a halfway chance of fixing it yourself, described here:
http://camerarepair.blogspot.com/2007/12/fixing-lens-error-on-digital-camera.html

SOURCE: The time and date setting

CoolJoe72 only posted one answer, but it was a good one, and it applies directly to you. Check it out here: http://www.fixya.com/support/t313710-having_reset_date_time .

(The short answer is that you need to change the date battery, which you'll find under the terminal cover; it's a CR1220.)