DVD Burning question - can't make backup of a few of my movies - using program DVD Decrypter - help!!! thanks!

Try Dvd shrink, it's totally free and i've never had a movie I can't burn (though I haven't tried to burn any of the ones you mention). It also shrinks the film so that it will fit on a standard blank dvd - a lot of companies make the films too long to fit on a standard dvd to prevent copying. It gives you the opportunity to cut out the menus and trailers before you burn which is also pretty cool. This software only rips the dvd to your hard drive - from there you have to use a burning software such as Nero to burn it to a dvd but once it's burned you can remove it from your hard drive.