Canon Pixma MP640 series Getting Started Manual page 21

Install the Software
7
Click Exit to complete the installation.
If Restart is displayed, follow the instruction to restart the computer.
Next, read "Loading Paper" on page 47!
After restarting the computer, remove the Setup CD-ROM and keep it in a safe place.
When using Macintosh, it is necessary to restart the computer before scanning using
the Operation Panel on the machine for the first time.
USB Connection