You was old windows. Served it to you pretty long. But suddenly it fails. what to do in current situation? In general, about and is this article.
First has meaning find service workshop by fix old windows. This can be done using yandex or bing, site free classified ads. If price services for repair you want - one may think task solved. If price fix you would can not afford - in this case you have solve question own forces.
So, if you decided own repair, then in the first instance necessary learn how repair old windows. For it sense use google or rambler, or look binder magazines "Junior technician", "Home workshop" and etc., or ask a Question on appropriate forum.
Think you do not vain spent efforts and this article least something helped you solve this task.