Even if you get PPM to work, you still have another tiny problem: that repository no longer exists. Try it for yourself: http://crazyinsomniac.perlmonk.org/perl/ppm/5.8/XML-SAX-Simple.ppd

You should be able to remove it from your repository list in PPM, try help rep at the command prompt for the instructions. (I have no access to any copy of PPM at this moment.)