There are various things that could be wrong, such as low batteries, incorrect settings, no memory card in camera, etc. I would suggest as an easy start that you download the "Powershot A460 User Guide Basic" (a .pdf file) from the Canon website and read pages 24-30. You probably do NOT need to install any software on your computer if you are using a PC. The computer should recognize the camera when connected to a USB port, and open the Scanner and Camera Wizard by default.
Here's a link to the CanonUSA page where you will find the A460 basic user manual. It is the fourth (4th) item down, under "Brochures & Manuals."
http://www.usa.canon.com/cusa/support/consumer/digital_cameras/powershot_a_series/powershot_a460#BrochuresAndManuals
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