--- sites\all\modules\moduleinfo\moduleinfo.module	Fri Sep  5 12:08:44 2008
+++ sites\all\modules\moduleinfo\moduleinfo.module	Sun Mar  8 00:21:45 2009
@@ -6,8 +6,8 @@
 which is displayed on the pages admin/build/modules and admin/build/modules/list
 ****/
 function moduleinfo_form_alter($form, $form_state, $form_id){
-    $files = module_rebuild_cache();
     if ($form_id=="system_modules"){
+      $files = module_rebuild_cache();
         foreach($form["description"] as $module=>$description){
             if ($files[$module]->status=="0")continue;