Yes, you would need to remove the screws that are on the sides first. Then you will need to pry the bottom rail off of the glass. You can usually do this by gripping and rocking it back and forth while pulling up on it. (If you have it setting on the floor upside down between your feet/knees). If needed, lay it flat and tap it gently with a block of wood and hammer. Flip it over and repeat. Be careful not to rip the marine glazing boot... it surrounds and protects the edges of the glass. And don't break the glass! Once you get it apart, post a picture of the pivot bar sitting next to a ruler. The measurements are critical.

You probably have a humidistat on your furnace that is set WAY too high. And you should not be running the humidifier if you dont want your windows to sweat. Having blinds closed or curtains drawn makes the window even colder. Are you sure they are locked? Being there is a bathroom nearby, there is higher humidity due to taking showers and baths. You would need to run your bath fan constantly after a shower. The moisture on the center and top of the glass is not between the panes, is it???

25-30 is where we have ours set and only see moisture when it gets really cold. A bathroom is probably the contributor for additional moister thus why it's on these windows only. Need to run exhaust for 10 minutes to get rid of excess!