Hi mabuzz1,
Reinstalling your PIXMA MG5420 should resolve the scanning issue that you are experiencing. To do this, please follow these steps:
1. Press the Windows key on your keyboard and the letter R, then let both go.
2. In the Run window, please type CONTROL PANEL and click OK.
3. Click on View devices and printers (or Devices and printers, depending on your view).
4. Right click the Canon MG5400 series and left click on Remove device. Repeat until all MG5400's are removed.
5. In the upper left corner, click on Control Panel (or the Back button).
6. In Control Panel, click on Uninstall a program (or Programs and features, depending on your view).
7. Click once on "Canon MG5400 series MP Drivers" and then click Uninstall at the top.
8. Follow the on screen prompts to uninstall the driver. When you click Complete, the driver is uninstalled.
9. Once done, please reboot your computer.
When your computer restarts, we will reinstall:
1. Please use the following link:
https://www.usa.canon.com/internet/portal/us/home/support/details/printers/inkjet-multifunction/mg-s...
2. Click the Select button next to "MG5400 series MP Drivers Ver. 1.01".
3. Click the Download button. The drivers will download.
4. Once the download is complete, open your downloads folder. To access this, press CTRL and J, then let both go.
5. Double click "mp68-win-mg5400-1_01-ejs.exe" to begin the installation.
6. Follow the on screen prompts to reinstall.
Once the installation has completed, please attempt to scan from the computer as a test:
1. Click on the Windows Start button and then click on the Canon Utilities folder.
2. Click on the IJ Scan Utility to open that application.
3. Click the Photo or Document button on the IJ Scan Utility.
If you are able to scan, please attempt to scan, this time using the operation panel of your PIXMA MG5420.
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