Which Perl distribution are you using? Based on the folder name "Perl64", I'm assuming that you're using a 64-bit Perl, is that correct?
Unless you need the 64-bit features (64 bit integers, etc.), you can use 32-bit Perl just fine on 64-bit Windows. If you're willing to go with 32-bit Perl, you check out the information that I shared at Re: Need help using CPan's pp - PAR Packager. So far, I personally haven't had problems installing PAR::Packer on 32-bit versions ActiveState Perl and Strawberry Perl.