This can be caused by a couple of things, but most likely it is because you are using Nero DVD software.
Nero installs a small piece of codec software on your machine that uses a form of protection that prevents
many high level applications like CoupleBox from running. To fix this and start using CoupleBox you need to
temporarily disable the Nero codec. That is done by locating a file called nevideo.ax (usually in C:\Program Files\Common Files\Ahead\DSFilter) and then changing its
name to something like nevideo.Lax. CB should now run just fine. To restore the Nero file just put its name back as before.
This problem was reported for Version 2.02 of Nero and we'll look into whether later versions solve this.
If you want more help problem on this then file a support request.