Thanks for the help.
John I.

It looks like you need new top sash guides. Those are the plastic guides at the top two corners of the sash that keep the balance in place during operation.
The video below will show you how these work and how they're replaced. As for identification, we can help with that, but we need you to remove an undamaged version and show me a clear picture of it from the front and side. Think of it like a mug shot.