Any idea why we are not able to install the same

PEBKAC, but that's too easy

Surely you must have gotten some error messages when you tried and failed to install XML::LibXML?

Something like is found in Re^2: XML::LibXML and XML::LibXSLT ppd and installing XML::LibXSLT.pm Perl5.14 on windows ?

XML-LibXML/README includes quite a bit of information on how to install.

Getting following error

Downloading XML-LibXML-1.64...done
Unpacking XML-LibXML-1.64...done
Generating HTML for XML-LibXML-1.64...done
Updating files in site area...done
Downloading XML-LibXML-1.64 install script...done
Running XML-LibXML-1.64 install script...Set up gcc environment - 3.4.
+5 (mingw-vista special r3)

Do you want to alter ParserDetails.ini? [yes] yes
C:\Perl\bin\perl.exe -MXML::SAX -e "XML::SAX->add_parser(q(XML::LibXML
+::SAX::Parser))->save_parsers()"
Can't load 'C:/Perl/site/lib/auto/XML/LibXML/LibXML.dll' for module XM
+L::LibXML: load_file:The specified procedure could not be found at C:
+/
Perl/lib/DynaLoader.pm line 226.
 at C:/Perl/site/lib/XML/LibXML.pm line 116.
BEGIN failed--compilation aborted at C:/Perl/site/lib/XML/LibXML.pm li
+ne 116.
Compilation failed in require at C:/Perl/site/lib/XML/LibXML/SAX/Parse
+r.pm line 8.
BEGIN failed--compilation aborted at C:/Perl/site/lib/XML/LibXML/SAX/P
+arser.pm line 8.
Compilation failed in require at C:/Perl/site/lib/XML/SAX.pm line 147.
system C:\Perl\bin\perl.exe -MXML::SAX -e "XML::SAX->add_parser(q(XML:
+:LibXML::SAX::Parser))->save_parsers()" failed: 65280 at install_scri
+p
t line 32, <STDIN> line 1.
ppm install failed: Command exits with 255:
  C:\Perl\bin\perl.exe install_script
  stopped
[download]

getting popup

[Window Title]
assertlibqAKHy7Ce.exe

[Main Instruction]
assertlibqAKHy7Ce.exe has stopped working

[Content]
A problem caused the program to stop working correctly. Please close t
+he program.

[Close the program]
[download]

That is output of what program? What url did it download?