If you have a Old Window that just does not do the trick anymore it might be time to replace it. You can pickout a new window often times at Home Depot or Lowes that is a Standard Size and do a quick replacement. Here i will walk you thought the different parts.
Part 1: https://youtu.be/JTgFNEBkc8g
Part 2: https://youtu.be/oaQ97MhCMFA
Part 3: https://youtu.be/t7B6DClbuME