I would highly, highly recommend
not using Super. It's really crappy and outdated. The video quality is often very blocky and pixelated, and there is very poor handling of certain input and output codecs.
Avidemux is much, much better for freeware encoding. I've used it professionally a few times, when in a bind, and away from my own hardware/software.
I would uninstall Nero -- it's utterly worthless. It can be replaced by several freewares for burning.
See this:
Need to replace Nero or Roxio ? - List of Free CD/DVD Burning Software
Reinstall and use ConvertXToDVD for conversion, as it's quite good for the all-in-one file>DVD process. It's the only all-in-one that I would suggest. Pretty much every other all-in-one, including freeware like DVDFlick, is awful by comparison. AIO software has always been this way.