Having originated from a UNIX environment, I have now been using Perl under Cygwin for quite awhile. It does everything I need it to do on a PC with all the utility of UNIX.

Cygwin currently provides Perl v5.8.6. After installing it, you can access CPAN as usual to download the modules you need.

For moving a UNIX-developed application to Windows, it is definitely the fastest way to go, and it should enable you to maintain a single code base for both platforms.