Instructions for Installing the XML-Xpath package
It is assumed that Active Perl has been installed and the PPM command is in the path.
The PPM (Perl Package Manager) connects to the internet and searches for the package. It then downloads it and installs it.
You may need Administrator privileges to get through firewalls. 

Open a Windows Command prompt window eg. Click on Start the Run then type 'cmd' in
the Run box and press enter.
When you see the command prompt it shows the current drive and directory path
and ends in a ">" e.g. 

c:\>

At the Windows command prompt type 'ppm' then press enter eg. it might look like this:

c:\>ppm  <--- ppm is typed at the command prompt
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> <--- this is the ppm command prompt
ppm> search XML-Xpath  <--- type this and press enter
Searching in Active Repositories
  1. XML-XPath       [1.13] XML-XPath
  2. XML-XPathEngine [0.03] XML-XPathEngine
  3. XML-XPathScript [0.15] XML-XPathScript
ppm> <--- this is the ppm command prompt
ppm>install 1 <--- type this and press enter
Package 1:
====================
Install 'XML-XPath' version 1.13 in ActivePerl 5.8.8.817.
====================
Downloaded 45606 bytes.
[... many file name are printed on the screen ...]
Successfully installed XML-XPath version 1.13 in ActivePerl 5.8.8.817.
ppm> quit  <--- type this and press enter
c:\> <--- back at the Windows command prompt. You have finished the installation.