Steve, these are really difficult to answer in a few short sentences. If you really have a historic house, like an Arts and Crafts bungalow, you may negatively change the value by replacing the plaster. For most houses on most streets, it probably is a wash on whether you have plaster or drywall. As long as it is done well, most buyers don't care either way. It could even turn into a negative if you had a lot of ornate plasterwork and your buyers wanted a more clean modern look.
For windows, about the same general things could be true. If you have a historic house and you put in new windows that were greatly energy efficient but didn't match the house, the value would probably go down. For most people and most houses, the new windows would be a definate plus.
One other point that I might mention is that some people do not like painted brick, either on the inside or the outside of a house. You take a material that is basically maintenance-free and make in into something that you have to maintain regularly. Many people probably don't care either way.
Don't forget that the three most important things to consider for the value of a house are location, location and location.