There was an issue with the latest NVidia drivers you mentioned in your post. Anyways, this has been fixed by a Xigncode update that was applied on Monday, Feb. 25th and should not occur anymore. In case it still happens for you, please send us a ticket at www.aeriagames.com/contact/support
and attach the xigncode.log, located in the Xigncode folder to it. We will make sure to forward it to the developers and see what we can do about it.