As part of its recent October 2020 Patch Tuesday updates, Microsoft made a significant change to the way Windows verifies drivers that could cause headaches for end users. The reason for the change is well-intentioned, as the software giant wants to prevent malware from exploiting vulnerable hardware drivers to compromise Windows 10 systems. Microsoft's new driver verification model will certainly help protect users, but it could also lead to driver errors in Windows 10 if the company can't verify a driver's software publisher. Windows 10 currently displays two driver error messages that users may see when the verification process fails. The first error message says "Windows cannot verify the publisher of this driver software", while the second says "There was no signature in the subject". These error messages imply that Windows discovered an incorrectly formatted catalog file while trying to validate a driver, and the installation process will fail.