Hi kspayne22,
Reinstalling your PIXMA MX870 should resolve this issue. To do this, please disconnect the USB cable from the unit and follow these steps:
1. Put the PIXMA MX870's CDROM in the CDROM drive. If the welcome screen appears, exit it.
2. Click on Start and then Run. If Run is not in your Start menu, please follow these steps to add it:
2-1. Click Start.
2-2. Right click the Start menu and left click on Properties.
2-3. Click on the Customize button next to 'Start Menu'.
2-4. In the Customize Start Menu window, place a checkmark next to 'Run Command'.
2-5. Click OK in the Customize Start Menu window.
2-6. Click OK in the Properties window.
3. Click Browse. In the browse window, click on My Computer.
4. In the window to the right, double click the CANON_IJ CDROM.
5. Double click the folder named WIN.
6. Double click the folder named Driver.
7. Double click the folder named DrvSetup.
8. Double click the file named DELDRV.
9. In the Run box click OK and follow the on-screen prompts to uninstall the PIXMA MX870.
Once the PIXMA MX870 has been uninstalled, restart the computer.
When the computer restarts, we will install the printer again:
1. Click on Start and then Run.
2. Click Browse. In the browse window, click on My Computer.
3. In the window to the right, double click the CANON_IJ CDROM.
4. Double click the folder named WIN.
5. Double click the folder named Driver.
6. Double click the folder named DrvSetup.
7. Double click the file named SETUP.
8. In the Run box click ok. Files will extract, the box will disappear.
9. Reconnect the USB cable from the printer to the computer.
The computer will recognize and install the PIXMA MX870 automatically.
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