You will need XML::Parser installed first (which in turn requires the expat library). XML::Parser comes with ActiveState Perl.

Having said that, XML::DOM is probably not a good choice of DOM module. XML::XPath would be better and no harder to install. XML::LibXML or XML::GDOME would give even better performance but may be harder to get going.

We could be more helpful if you'd included a copy of the errors you're getting from the install process.