Have you tried to unblock your driver files yet? If not, right click on your driver file(s) and select properties from the context menu, click "Unblock" in the lower left hand of the properties window.
It's been awhile since I've managed images in LANDesk but I do remember having a very similar issue that this resolved. I would suggest unblocking the driver file before extraction. This way, you wont need to unblock each extracted file individually.