All you need is the driver for the printer to work. The software is just extra software to organize, edit, and print photos, but its not required.
It also seems Windows 7 has a driver included for the IP4000 or it available as an optional update from Windows Update as the Canon site only lists a driver add-on module and PhotoPrint EX software.
Have you checked Device Manager for any devices with errors, or any unknown devices under the USB section? Also does it list any printers under Devices & Printers in the Control Panel?
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