Error Message Appears And The Scangear (Scanner Driver) Screen Does Not Appear - Canon Pixma MX520 Series Online Manual

Error Message Appears and the ScanGear (Scanner Driver)
Screen Does Not Appear
Check 1: Make sure that your scanner or printer is turned on.
Check 2: Turn off your scanner or printer, then reconnect the USB cable
and replug the power cord.
Check 3: Connect the USB cable to a different USB port on the computer.
Check 4: If the USB cable is connected to a USB hub, remove it from the
USB hub and connect it to a USB port on the computer.
Check 5: Make sure that MP Drivers is installed.
If not installed, install MP Drivers using the Setup CD-ROM.
Check 6: Select your scanner or printer on the application's menu.
Note
The operation may differ depending on the application.
Check 7: Make sure that the application is TWAIN-compliant.
You cannot open ScanGear (scanner driver) from applications not supporting TWAIN.
Check 8: Exit ScanGear if it is running on another application.