Most of the time the reason the window does not stay up is because the sash has become disengaged from the balance shoe in the frame that helps it move smoothly up and down. THIS IS NOT A DAMAGED WINDOW.
Common household condensation, or “sweating” on windows is caused by excess humidity or water vapor in the air coming in contact with a cold surface such as a mirror or glass window. It then turns to water droplets and is called condensation. There is nothing wrong with your new windows.