Carol - If you want to avoid RM Weld and a few thousand registry entries then Hirudin is right - covert to *.wav. Besides, it's much easier to edit de-compressed material.

dBpoweramp Music Converter is the one to get. [ free ]
http://www.dbpoweramp.com/dmc.htm

The codecs here:
http://www.dbpoweramp.com/codec-central.htm

Features a right click context menu - makes it all so easy-peasy. ;)

Andre

Possibly DVD Fab Platinum could handle it - you could try it.
http://www.dvdfab.com/download.htm

Another option is to try a transcoder such as SUPER.
http://www.erightsoft.com/SUPER.html

For stop motion / still image sequencing one of the better apps for this kind of thing is Picture To Exe. You can build a sequence of images and save as video (various format options which you'll see).

http://www.wnsoft.com/apr/index.html
http://www.wnsoft.com/apr/video-slideshow.htm

Worth well purchasing - helpful forum and committed developer (Igor). Compared to Photodex ProShow Producer (similar electronic slide show / presentation software) this is a bargain and much more compact and efficient to use. I've also used with it Scribus to make professional presentations with great success.

http://www.wnsoft.com/download.htm

Note the new version 5.00 is still a beta but has a number of new features including zoom / pan etc. Best on a recent model computer with good graphics. Read more in the forum:

http://www.picturestoexe.com/forums/index.php?

The other option is to use IrfanView to make a slide show and build a stand alone exe. The hot key is [ W ] to get started. Adjust Slide Advancement to Automatic, about 0.150 secs is good for stop motion.

Andre