I was having the same problem. After much cussing and 2 hours later, I cam to the conclusion that you must have Perl installed in a single name folder (ie: no spaces). I'm using ActivePerl. I installed it to C:Perl. The full path in IIS5 is "c:perlbinperl.exe %s %s". Don't forget to put ".cgi" under the extension option. That should do it for you. Hope that helps!