I did install it. I can see it in ppm.

The file 'pp.bat' should therefore be in your perl/bin folder. Is it there ?
If so, then you just need to add to your perl/bin folder to the path by running:

set PATH=C:\perl\bin;%PATH%
[download]

(I'm assuming that your perl is in 'C:/perl/bin' - otherwise modify accordingly.)

If, otoh, 'pp.bat' is not in your perl/bin folder, then that's the problem ... the installation did not proceed correctly. Try installing it again (you might first have to run 'ppm remove PAR'), and if that doesn't work, tell us what your 'perl -v' outputs and also which ppm repository is providing this troublesome PAR package.

Cheers,
Rob