Canon Pixma MP800 suddenly invisible to my OS 10.6.4 mac

I am a (usually) technically proficient longtime mac user, and I have spent 4 hours trying everything to solve this but can't.
A month ago or so I set up this new imac, and dowloaded the canon website drivers for printing and scanning - and set up and used printing and scanning sucessfully for a while.
The Canon PIXMA MP800 is hooked up via a USB cable directly to iMac.
Recently I tried to scan and couldnt - tried to print aqnd couldnt. Got errors that talked about being offline. So I deleted the printers, but when I tried to re-add the printer - there were no printers to add on the list.
I have tried reinatalling everything I can, incuding the canon printer drivers file on the apple website. I have done the "hold control while assing printer" thing to reset things. no help.
One thing in my attempts that I found odd...throughout this process, I have found my Library/Printers/ folder completely empty. Is that right? Or is my new mac set somehow that I just cant see the files that are there?
Can it be that an OS update has screwed up printing communication?
Never been so upset and frustrated at a mac before. What the heck is going on!?!
Help!! thanks in advance.

The Canon PIXMA MP800 is hooked up via a USB cable directly to iMac.
Recently I tried to scan and couldnt - tried to print aqnd couldnt. Got errors that talked about being offline. So I deleted the printers, but when I tried to re-add the printer - there were no printers to add on the list.
According to http://support.apple.com/kb/HT3669?viewlocale=en_US, the driver for this printer doesn't support scanning.
I have tried reinatalling everything I can, incuding the canon printer drivers file on the apple website. I have done the "hold control while assing printer" thing to reset things. no help.
Use Software Update to download the latest drivers to get printing working again.
One thing in my attempts that I found odd...throughout this process, I have found my Library/Printers/ folder completely empty. Is that right? Or is my new mac set somehow that I just cant see the files that are there?
Which Library/Printers/ folder is empty? The one in your home directory? Or the one on your hard drive? The one on your hard drive should have the installed drivers, but the one in your home directory will be empty until you launch the proxy for the added printer.
Hope this helps.

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After speaking to Apple yesterday about a separate matter, I was talking to the tech support guy about not being able to scan wireless on my Canon MP800 but that I can print wirelessly. The printer not technically a wireless printer, but is found on network anyway when plugged into airport, the tech guy said I should be able to scan too. He suggested that I go on canon site and download latest print driver for my printer for OS X. I did this today as well as updated the other software it had available for updating. I installed as suggested, simple install, restarted computer as required, then tried to print and I cannot find my Canon MP800 anymore! Not in the printer menu. Can't find it by "add printer". Nowhere to be found! Any suggestions?

Regarding the scanning via Airport, this will not function due to driver constraints. The Canon scanning software only supports direct USB connections.
As for the printer, the following details the procedure for repairing faulty installations of the Canon PIXMA drivers.
1. Open Printer Setup Utility, click on Printer Setup Utility and select Reset Printing System.
2. Close the Printer Setup Utility.
3. Go to Library > Printers > Canon and delete the contents of the BJPrinters folder.
4. Go to Library > Receipts and delete the file/s Canon MP800 xxx.pkg
5. Empty the Trash
6. Restart the Mac
7. Install the latest version of the Canon driver. Check the Canon web site to ensure you have the latest version.
8. Once the driver installation is complete, go to Applications > Utilities and open Disk Utility. Run the Repair Disk Permissions option.
9. Open Printer Setup Utility and click Add.
10. Select the Default Browser view and select the Canon printer connected via the USB port. The Print Using menu should automatically change to Canon IJ Printer.
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Regarding the scanning via Airport, this will not function due to driver constraints. The Canon scanning software only supports direct USB connections.
As for the printer, the following details the procedure for repairing faulty installations of the Canon PIXMA drivers.
1. Open Printer Setup Utility, click on Printer Setup Utility and select Reset Printing System.
2. Close the Printer Setup Utility.
3. Go to Library > Printers > Canon and delete the contents of the BJPrinters folder.
4. Go to Library > Receipts and delete the file/s Canon MP800 xxx.pkg
5. Empty the Trash
6. Restart the Mac
7. Install the latest version of the Canon driver. Check the Canon web site to ensure you have the latest version.
8. Once the driver installation is complete, go to Applications > Utilities and open Disk Utility. Run the Repair Disk Permissions option.
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10. Select the Default Browser view and select the Canon printer connected via the USB port. The Print Using menu should automatically change to Canon IJ Printer.
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Have you tried rebooting the router? I would unplug it, wait a few seconds, then plug it back in. Be sure you know the password etc. if that doesn't work, try unplugging and rebooting the printer. Good luck!

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Here's what I found there, Niel:
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