Are your @INC paths and environment variables at the command line, the same as through another script? Try putting this at the top of your script (before using Win32::Process::Create) and run in both scenarios:

use strict;
use warnings;
$|=1; # Buffering
BEGIN {
    print "#### Environment Variables ####\n";
    foreach (keys(%ENV)) {
        print "$_ = $ENV{$_}\n";
    }
    print "#### \@INC ####\n";
        foreach(@INC) {
        print "$_\n";
    }
    die "#### And there you go.  Your info should be displayed below: 
+####\n";
}
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