The following cut down version of your script (removing the CGI component) seems to function correctly. Maybe you have a down-level version of something?

#! perl -slw
use strict;
use Win32::PingICMP;

my $p = new Win32::PingICMP;

die 'No hosts specified' unless @ARGV;

print $_, ' : ', $p->ping( $_ ), ' : ', $p->details->{host}, ' : ', $p
+->details->{status} for @ARGV;

__END__
D:\Perl\test>ping.exe perlmonks.com

Pinging perlmonks.com [209.197.123.153] with 32 bytes of data:

Reply from 209.197.123.153: bytes=32 time=280ms TTL=242
Reply from 209.197.123.153: bytes=32 time=261ms TTL=242
Reply from 209.197.123.153: bytes=32 time=250ms TTL=242
Reply from 209.197.123.153: bytes=32 time=251ms TTL=242

D:\Perl\test>ping.exe 128.231.013.057

Pinging 128.231.11.47 with 32 bytes of data:

Request timed out.
Request timed out.
Request timed out.
Request timed out.

D:\Perl\test>ping 128.231.013.057 209.197.123.153
"my" variable $count masks earlier declaration in same scope at d:/Per
+l/site/lib/Win32/PingICMP.pm line 121.
128.231.013.057 : 0 : 128.231.013.057 : IP_REQ_TIMED_OUT
209.197.123.153 : 1 : 209.197.123.153 : IP_SUCCESS
[download]

The versions I am using are

D:\Perl\test>perl -mWin32::PingICMP -de1

Loading DB routines from perl5db.pl version 1.19
Editor support available.

Enter h or `h h' for help, or `perldoc perldebug' for more help.

Win32::API::Type::CODE(0x1b6af60)(d:/Perl/site/lib/Win32/API/Type.pm:4
+0):
40:         my $section = 'nothing';
  DB<1> M
'AutoLoader.pm' => '5.59 from d:/Perl/lib/AutoLoader.pm'
'Carp.pm' => '1.01 from d:/Perl/lib/Carp.pm'
'Carp/Heavy.pm' => 'd:/Perl/lib/Carp/Heavy.pm'
'Config.pm' => 'd:/Perl/lib/Config.pm'
'DynaLoader.pm' => '1.04 from d:/Perl/lib/DynaLoader.pm'
'Exporter.pm' => '5.566 from d:/Perl/lib/Exporter.pm'
'Term/Cap.pm' => '1.08 from d:/Perl/lib/Term/Cap.pm'
'Term/ReadLine.pm' => '1.00 from d:/Perl/lib/Term/ReadLine.pm'
'Win32/API.pm' => '0.41 from d:/Perl/site/lib/Win32/API.pm'
'Win32/API/Struct.pm' => '0.40 from d:/Perl/site/lib/Win32/API/Struct.
+pm'
'Win32/API/Type.pm' => '0.40 from d:/Perl/site/lib/Win32/API/Type.pm'
'Win32/PingICMP.pm' => '0.02 from d:/Perl/site/lib/Win32/PingICMP.pm'
'perl5db.pl' => '1.19 from d:/Perl/lib/perl5db.pl'
'strict.pm' => '1.02 from d:/Perl/lib/strict.pm'
'vars.pm' => '1.01 from d:/Perl/lib/vars.pm'
'warnings.pm' => '1.00 from d:/Perl/lib/warnings.pm'
'warnings/register.pm' => '1.00 from d:/Perl/lib/warnings/register.pm'
  DB<1>
[download]