Check out Win32::SystemInfo. Here's a little code to get you started:

use Win32::SystemInfo;

# Get Memory Information

print("Memory Info:\n");
my %mHash;
Win32::SystemInfo::MemoryStatus(%mHash,"MB");
foreach (sort(keys(%mHash)))
   {
   print("$_\[$mHash{$_}M\]\n");
   }
print("\n");

# Get Processor Information

my %pHash;
my $proc = Win32::SystemInfo::ProcessorInfo(%pHash);
print("Number of Processors[$pHash{NumProcessors}]\n");
foreach my $Processor (keys(%pHash))
   {
   if($Processor ne 'NumProcessors')
      {
      print("Processor[$Processor]\n");
      foreach (sort(keys(%{$pHash{$Processor}})))
         {
         print("$_\[" . $pHash{$Processor}->{$_} . "\]\n");
         }
      print("\n");
      }
   }
}
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