If you are unable to remove the printer through the GUI like NT50 recommended, you can modify the registry.
Please be sure to read through the entire
list of steps before completing them.
Follow these steps to remove the printers:
Unplug your printer from your computer and turn off the printer
Go to Start -> Run
Type in REGEDIT and click "OK"
From there, navigate to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Print\Printers by clicking on the plus signs next to each entry
Once you are in this Key (Folder), you will see the list of printers you have installed under the plus
In your case you should see, Cannon Inkjet i.p. 2600, Cannon Inkjet i.p. 2600 copy 1 and Cannon ip 2600 like you posted above.
Right click each of these folders and click Delete NOTE DO NOT DELETE THE "PRINTERS" FOLDER THAT YOU ARE IN, WINDOWS REQUIRES THIS FOLDER FOR PRINTING, ONLY REMOVE THE PRINTERS THAT ARE INSTALLED.
Once all of the Printer Keys are removed that you want gone, close the Registry Editor and Reboot your computer (*I recommend removing all of them so that you can add back what you need later)
Once your computer comes back online, go into your Start -> Devices and Printers folder and ensure that the printers are infact missing
Once this is complete, I would recommend downloading the latest Windows 7 Drivers from the Canon website for your printer and reinstall the printer this way.
I hope this helps, if you have any questions please be sure to ask before moving forward!
PLEASE NOTE: MAKE SURE YOU FOLLOW THESE STEPS EXACTLY
AS WHEN YOU ARE MODIFYING THE REGISTRY ON A COMPUTER, IF YOU DELETE OR MODIFY SOMETHING WITHOUT KNOWING IT CAN BE HARMFUL TO YOUR COMPUTERS OPERATION!
Sorry for the disclaimer and CAPS on this post, but you need to make sure you are careful when working in the registry.