How to fix: "Windows cannot verify the digital signature for this file" error in Windows 8.1, 8, 7 & Vista.
In Windows 8 (& 8.1), 7 & Vista Operating Systems, you cannot load a driver or execute a program that hasn’t a Driver Signature. Driver Signing is a method to verify the identity of the software publisher or the hardware (driver) vendor in order to protect your system from been infected with malware rootkits,