Looking at this report I am not sure why does it fail and how to fix it http://www.nntp.perl.org/group/perl.cpan.testers/2008/08/msg2041140.html
Besides, AFAIK PAR::Packer is not one of the prereqs of Padre so what are these messages regarding PAR::Packer? Known uninstallable prereqs PAR-Packer-0.982 - aborting install Gabor