To set file signature verification options
Open System in Control Panel.
On the Hardware tab, click Driver Signing.
Under File signature verification, click:
Ignore to allow all device drivers to be installed on this computer, regardless of whether they have a digital signature.
Warn to display a warning message whenever an installation program attempts to install a device driver without a digital signature. This is the default behavior for Windows.
Block to prevent an installation program from installing device drivers without a digital signature.
To open System, click Start, click Control Panel, click Performance and Maintenance, and then click System.
If you are a logged on as an administrator or as a member of the Administrators group, under Administrator option, click Apply setting as system default to apply the selected setting as the default for all users who log on to this computer.