making a video w/my camera but watching it record on my computer?

I'm not entirely sure I understand, but it would help if you were to provide the model number of the camera...

The PowerShot has a composite video/audio output. I don't know if it can output at the same time it records, but many cameras can, so it's worth a try. Your camera should include a cable that plugs into the PowerShot -- the other end has multiple connectors, including a yellow connector, which is the composite video connector. (It should look like this: http://en.wikipedia.org/wiki/File:Composite.jpg)

This connector can plug into any monitor that accepts composite video input. For the most part, that means a TV, since most computer monitors don't have a composite video input (a single jack, usually yellow), although a few high-end ones do. In any case, you don't need to send it through a computer, and most computers (including laptops) wouldn't accept a composite video input anyway.

do u mean like u want to view you film while it is downloading to ur pc?