1. Start - All Programs - Attachment Run (enter gpedit.msc) OK or press Enter. Open the Local Group Policy Editor;

2. In the opened Local Group Policy Editor window, find: User Configuration - Administrative Templates; in the Administrative Templates expansion item, find: System and expand it; in the system expansion In the item, find: Driver installation, and left-click: Driver installation; in the right window corresponding to driver installation, find: Device driver code signature, and double-left-click: Device driver code signature;

3. In the opened device driver code signing window, select: Enabled. In the drop-down box of options, there are: Warn, Block, and Ignore to choose from.

Warning: Notifies the user of unsigned files and allows the user to decide whether to stop or continue the installation and whether to allow installation of unsigned files.

Block: The command system refuses to install files that are not digitally signed.

Ignore: Commands the system to continue the installation (including installing files that are not digitally signed).

If you want to install a driver file without a digital signature, you can choose: Ignore, and then click: OK; after installing the Mastercam X5 driver, it is recommended to set the item you just set to ignore to a warning ( default settings) to enhance system security.