Whoa!
Let's straighten this misunderstanding out.
DVBViewer is not up to the job of viewing encrypted channels, so don't bother with it. Download progdvb or mytheatre. There are FREE versions of both (I know the last free, and most stable version of mytheatre is 2.76) so don't worry about trial or full software vresions.
Both these applications support 'MDPlugins'. That means that you can get a utility called 'Yankse' and install it into the MDPlugins directory which exists within both of the above applications. You can get that here :-
h##p://yankse.dvbnetwork.com/.
The above program does the de-crypting for you, but it needs the keys to unlock the satellite stream. You will need a 'softcam.key' file, which is the file containing the information to unlock the encrypted channels. The softcam download utility mentioned at the top of this thread is used to get this file, and stick it in the MDPlugins directory for you. You have to specify the MDPlugins directory in the utility. Press the button to get the key file, and away you go.
Hope this is clear.