How do I find my Canon printer model name to download drivers by just knowing the serial number

[bababooey]

I can't believe your stupid printer doesn't have a model number written on it.  My serial number starts with HPWA - can you tell me what the model is based on that?  I have to download drivers for it.

[Stephen]

Support can help at 1-800-OK-CANON (800-652-2666). 

If you're out of the USA, check the following site for international support options: http://Canon.us/ggdey