1. Download print drivers for Windows 10 (imageCLASS D420 MFDrivers)
2. With Printer turned off, install the MFDrivers.
3. Now turn your Printer back On and make sure it is connected to a USB port or step 4 won't work.
4. Will need to add the printer manually. Go to Windows "Printers and Scanners", Click on Add Device, after a few secs you should have option to click on "Add manually", click on Add manually, Select "Add a local printer or network printer with manual settings", Click Next, Make sure "Use a existing port" is selected and click on dropdown to select "USB002 (CanonD400-450 (UFRIL LT))", main thing here is to select the port that has your Canon listed, Click next, You should see Canon listed under Manufacturer, Select Canon and then under Printers select "Canon D400-450" click Next and make sure this option "Use the driver that is currently installed" is selected, Click Next, Choose a Printer Name, Click Next, Printer Sharing is up to you, click Next, Then Click on Print Test Page, Note if this doesn't work you just need to power off your printer and power it back On.