cpanm has a "--reinstall" option that occasionally gets me out of trouble. Sometimes just using an alternate installer (cpan vs cpanm, for example) is enough to get things sorted out. But you know, another method is to simply download the tarball, unpack it into a folder, enter that folder, and type the mantra.
Look at the module's Build.PL to determine the dependencies it requires, and make sure first they're already installed. They probably mostly are, since you already tried installing it once. After you've got the dependencies figured out, you can type (windows):
...on many platforms you would need to prepend the ./, but not for Windows.