Symptoms
- Error message references driver signature verification or enforcement
- A specific driver won't install or load
- Often happens with older hardware, custom drivers, or specialized equipment
- The device doesn't work because its driver can't load
Likely causes
- CommonDriver isn't digitally signed by MicrosoftWindows blocks unsigned drivers by default as a security measure.
- CommonDriver is signed but with an outdated or untrusted certificateOlder drivers sometimes use certificates Windows no longer trusts by default.
- PossibleTest-mode or beta driver from a manufacturerSome manufacturers distribute drivers that require test signing mode to be enabled.
- Less commonCorrupted driver packageA damaged download can sometimes present as a signature problem.
What to do
- Confirm the driver comes from a legitimate, trusted source; downloading directly from the hardware manufacturer's official website is safest.
- Check if a newer, properly signed version of the driver is available from the manufacturer, since this is the best long-term fix rather than bypassing the check.
- If no signed driver exists and you trust the source, you can temporarily disable driver signature enforcement for one boot: restart while holding Shift and clicking Restart, then go to Troubleshoot > Advanced options > Startup Settings > Restart, and press the number key for 'Disable driver signature enforcement.'
- Install the unsigned driver while enforcement is disabled for that session; note that this setting reverts on the next normal restart.
- Understand that leaving driver signature enforcement permanently disabled reduces a meaningful security protection, so use this only as a last resort for hardware you trust.
- If the device is old and no longer supported, consider whether a generic Windows-provided driver class (like a generic USB or printer driver) might work instead.
- Avoid downloading drivers from third-party driver-download sites, since these are common sources of malware disguised as drivers.
Tools and parts
- Another device to download drivers if needed
When to call a pro
If you're unsure whether a driver is safe to install unsigned, or the hardware is important and lacks any signed driver option, a technician can advise on the safest path forward.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.