tablet-encode is a perl script front end to mencoder. mencoder comes along with mplayer. mplayer is cross platform and available for (microsoft) windows, as is perl.
tablet-encode requires perl and mplayer. Do you have those installed? tar is used to extract tar balls. The best way to get a multitude of unix utilities onto a windows box is to install cygwin from www.cygwin.com (free and open). tar xf tarball.tar or for gzip compressed tarballs tar xzf tarball.tar.gz