Try killing all of the InCD… processes, and the lightscribe process. Then try building/burning your En project again.
There’s a free program called EndItAll (google it) that is supposed to shut down all unnecessary processes so you can’t troubleshoot issues like this. I have another program to do that that is part of a paid suite, so I can’t vouch for EndItAll’s effectiveness.
-Jeff
The Focal Easy Guide to Adobe Encore DVD 2.0