Installaltion of DeviceLock either performed from a CD/DVD drive, or from a removable storage device fail when there is no write access provided for 'DVD/CD-ROM' or 'Removable' device types in the respective access control list applied to the problem computer.
This known issue has been fixed in version 7.1.35138.
1. Upgrade to the latest version of DeviceLock (7.1.35138 or higher)
2. If an upgrade is not an option, you can copy all installation files to a local disk and install DeviceLock.