esto es lo que hice.
C:\Perl\bin>ppm
PPM - Programmer's Package Manager version 3.4.
Copyright (c) 2001 ActiveState Software Inc. All Rights Reserved.
Entering interactive shell. Using Term::ReadLine::Perl as readline library.
Type 'help' to get started.
ppm> install XML::Simple
Searching for 'XML::Simple' returned no results. Try a broader search first.
Gracias por tu respuesta.