Try Strawberry Perl. I think Imager::File::PNG may come with it...I have strawberry perl 5.14 installed, and Imager::File::PNG seems to be installed...I'm not sure but I think it came with the perl, if not, it must have been easy to install.
Okay. I'll try that in the next few days. I tried 5.16 of that a while ago, but it didn't have Tk and a few others installed. I forget if it still has PPM.
Edit: My problem is that make/dmake can't find libpng/zlibon my pc.Had the same issue on my bro's laptop, with no solution.