The steps below will allow the correct printer drivers to be loaded into a Windows 10 machine. Most printer manufacturers, including Canon, do not update their printer drivers for old or obsolete products with a digital signature so they may be used in Windows 10. So, we must execute a workaround. It is a bit tedious but does the job. It also has serious risks if the drivers are infected with malware.
Do NOT execute this workaround for installing unsigned printer drivers (or anything else) in Windows unless the drivers are from an official manufacturer's website, CD, or DVD! If you have a printer that needs to be installed in Windows 10, ONLY use the installation CD/DVD that came with the printer to be safe! Note that Canon divisions in other parts of the world don't automatically end all support for older products made by Canon, like the USA division. It would be safe to download installation software from these other divisions of Canon e.g., drivers for their obsolete products e.g., a MX310 MFC. You must be very careful so you won't infect your computer with some kind of malware using drivers obtained from unknown sources.
The steps below disable all of the built-in firmware and software that protects Windows from malware. However, when the drivers are installed, these protections may be re-enabled.
To allow unsigned drivers to be loaded, secure boot in the BIOS setup utility must first be disabled (and prevented from becoming enabled during a future reboot). In addition, Windows 10 must be put in "test mode".
At the Windows 10 desktop:
1. search for "Advanced Startup Options", choose "Advanced startup", click "Restart Now". This will boot Windows into a special menu.
2. On the "Choose an option" page, click on "Troubleshoot", "Advanced options", "UEFI Firmware Settings", "Restart". This step causes the BIOS menu to show up when the system is rebooted. Note: if you know how to get to the BIOS setup utility quickly, this step can be skipped.
3. During the reboot, the BIOS Setup Utility Menu will pop up. Press F10 (or whatever key is required), choose "Boot Options" in the BIOS Setup Utility. Arrow down to "Secure boot", press enter, arrow up to "Disable", press F10 (or whatever key is required), save changes and exit. The system will reboot and stop at a special boot screen.
4. The boot screen will give a code e.g., 1234. Enter the code and press enter. Reboot.
5. Once back in Windows, open an admin command prompt and enter the following commands:
bcdedit /set nx AlwaysOff {This command disables DEP (Data Execution Prevention)}
bcdedit /set testsigning On {This will allow unsigned drivers to be loaded}
6. Reboot Windows. At the desktop screen there should be some small text in the lower right hand part of the screen that is like this example:
Test Mode
Windows 10 Enterprise
Build 19041,vb_release,191206-1406
This is your notice that the OS is no longer protected.
7. Run your printer installation software.
8. When done, re-enable secure boot. At an admin command prompt enter:
bcdedit /set nx AlwaysOn
bcdedit /set testsigning Off
Re-enter the BIOS Setup Utility using the steps 1-3 above and re-enable Secure Boot. Reboot Windows. You will know that DEP and secure boot are turned on by the disappearance of the "Test Mode" dialog box.
More info from this helpful site:
https://www.howtogeek.com/167723/how-to-disable-driver-signature-verification-on-64-bit-windows-8.1-...
