You don't absolutely need a PPM package to install most modules. You just need a program to unzip/untar CPAN packages, either WinZip, or even the perl modules Archive::Zip and Archive::Tar (I think those modules are in the standard PPM repository). You'll also need nmake
to build modules from Makefiles.
Once you have all that, you should be able to use CPAN or even better CPANPLUS. At which point you should be able to install the majority of CPAN modules, pretty much any that don't require a GNU make or a compiler, or have UNIX specific code.