If you're willing to switch off of ActivePerl to go to Strawberry Perl, you might have an easier time with some of this stuff.

In your other thread, I offered up a suggestion and pointed out that Strawberry Perl comes with Net::SSH2 already installed (Re^6: threads, forks and SSH). Also, RonW pointed out that Net::SSH2 is included with Strawberry Perl in his post. I know that you stated in that thread that you are stuck with ActivePerl. However, you should be able to download and use Strawberry Perl's portable editions. And if using portable Strawberry Perl directly isn't desirable for your final solution for your code, you could install Par::Packer and use its pp utility to bundle your code into a stand alone executable.

And if you really want/need just Math::Pari, the latest 32-bit builds of 5.20 and 5.22 versions of Strawberry Perl already come with Math::Pari. (NOTE: Math::Pari is not included in the latest 64-bit builds of Strawberry Perl. But that shouldn't be an issue unless you need 64-bit Perl.)

In my opinion, moving to Strawberry Perl will make your life easier and let you do what you want without fighting to get modules installed. I haven't used it myself, but another alternative to ActivePerl on Windows systems is Citrus Perl. Basically, I think if you can get yourself out of the box that you're finding yourself in, you might find things are no where nearly as bad you currently think that they are.