The choice between Lossless and Lossy depend on your goals for the movie. Lossless compression preserves all the data. What goes in it is exactly what comes out of it. Lossy compression eliminates some of the data. This normally results in a lower quality movie.
Spatial compression is applied to a single frame and can be lossless or lossy.
Temporal compression is where differences between frames are identified and only the differences are stored. If you are running VirtualPC, you better have all the File Sharing extensions and control panels in the System folder if you don't want all sorts of nasty memory error messages. DataViz does not have translators for ClarisWorks 5 in it. It translates to ClarisWorks 4 format and lets ClarisWorks 5 read that file. An Iomega ZIP drive is a really neat thing to have.