Try verifying that your perl is installed correctly. At a C: prompt in a dos window type:
. You should get a listing something like this:
This is perl, v5.6.1 built for MSWin32-x86-multi-thread
(with 1 registered patch, see perl -V for more detail)
Copyright 1987-2001, Larry Wall
I looked at the website you referred to and there are instructions there requiring that you build Perl with a C+ compiler. Is it possible that either you missed that step or something went arwy in the process?
Update Also, instead of typing ppm at the command prompt, try using it from the Run box off the start bar. Just type ppm in the Run dialogue box, hit enter and see if it brings PPM up.