There are many ways to install a module beyond ppm:

• If you have CPAN (or even better CPANPlus) installed you can use it
• if you have nmake installed you can follow this link to XML::Twig and download it from CPAN, do the magic incantation :

  tar zxvf XML-Twig-3.08.tar.gz
  cd XML::Twig-3.08
  perl Makefile.PL
  make
  make test
  su (is it called su on windows?)
  make install
  [download]

• as XML::Twig is pure Perl you can also just download it, un-tar it and copy Twig.pm in your Perl tree, in the same directory as XML::Parser (something like C:\Perl\site\lib\xml)