Mary, Are you referring to window restoration or just sealing up some existing windows? The two are going to be very different type professionals. If it it just sealing up some exterior trim on windows, a decent painter can do that. If its window restoration, that is a different ball of wax. Window restoration is a very niché marketplace. The best thing to do is start with a Google area search near your home and especially in those areas that are more heavily concentrated in older homes. Next would be to ask around any of the historic districts that are in your area and see who they might have a list for. Hope this helps.

Good advice in the 2 posts above. The Integrity is a solid choice, and any Marvin product is as good as you'll find with a real wood interior. Wood is what it is, so there will always be the question of WHEN, not IF it will ultimately degrade, but with proper maintenance the two Marvin options should have a good lifespan. As WoW alluded to earlier, the Sunrise (or any premium vinyl) will generally offer superior performance (better u-values and air leakage), a lower price, better warranty, and less maintenance, but the appearance factor is more important for some, and wood can't be beat in that area. Regarding the installation company, you would vet them just as you would another window company, look at things like review sites, history, do they have a physical location, references, view their work, BBB, trade affiliations, etc, etc.

looks like an afterthought to create a closure piece. I can't see much, if any load getting into it so I don't believe there's anything "structural" about it. Definitely looks like it needs some flashing to keep the end from getting saturated. Find a good carpenter as he's going to need to be creative to close that back up looking nice.

It will be a structural issue if the corner studs have moved due to foundation settlement or rotted due to water penetration. It might also be swelling of OSB sheathing or movement of the decorative stone cladding cap (that's my guess ... trim should not be touching the cap.) Someone needs to get on a ladder and look at the bottom of the trim board.