CD Burn XP (google it) is a free burning suite that supports pretty much anything you would need, including what you describe there.
Because of the DVD Decoder license fee, I don't know of any freeware DVD playback software. PowerDVD and WinDVD both have downloadable trials. Really the cheapest way to get DVD playback software is to buy a drive and use the OEM software that comes with it (usually a basic non-surround-enabled OEM version of one of the above packages).
Alternatively, you can check your PC Mfg's web site. Sometimes the PC vendor will offer a (almost invariably outdated, but still functional) DVD playback program for download, it will be similar to the above, a very basic but perfectly functional program. I've seen this from Dell / HP / Compaq / etc, but it varies from model to model.