# outside of loop:
$dir = "C:/ReportExtract/Director";

# ...

# inside your foreach loop:
if (-e "$dir/$temp" ) {
  unless ( $zip->addFile("$dir/$temp") ) {
    print "Error: failed to add $dir/$temp to archive.\n";
  }
} else {
  print "Error: $dir/$temp does not exist!\n";
}