Update: Until now I was not able to run Photo Gallery on Windows 10 64 bit (Swedish) at all. I got this error trying to start, and Windows Live Photo Gallery was not responding:
Det gick inte att starta en DCOM-server: {00F30F64-AC33-42F5-8FD1-5DC2D3FDE06C}. Felet:
"740" inträffade när det här kommandot startades:
"C:\Program Files (x86)\Windows Live\Photo Gallery\WLXPhotoGallery.exe" /PhotoViewerComServer {00F30F64-AC33-42F5-8FD1-5DC2D3FDE06C} -Embedding
Approximate translation into English:
A DCOM server would not start: {00F30F64-AC33-42F5-8FD1-5DC2D3FDE06C}. The error:
"740" occurred when this command was run:
"C:\Program Files (x86)\Windows Live\Photo Gallery\WLXPhotoGallery.exe" /PhotoViewerComServer {00F30F64-AC33-42F5-8FD1-5DC2D3FDE06C} -Embedding
Trying to run Photo Gallery as administrator made no difference. The Gallery interface shows up, but reports "Not responding" after a few seconds, and you it does not react to mouse clicks or key strokes.
However, after entering Windows Update I noticed that there were updates waiting for a restart. Restarting the computer (be sure to select RESTART, not shut down) the update was installed, and new updates were availibale. An update to Win10 edition 1511 was installed (automatically restarting the computer three times – the update took about 15-20 minutes I think so it must be quite big).
After this I could start Windows Live Gallery 2012 32 bit. It's currently running on this Windows 10, 64 bit computer. Facial recognition and all!
Photo Gallery is currently processing all images, about 7000 images left and counting down towards 0. I believe it's extracting the face tags and putting them into its database.
I don't know how this is done, since it's still SQL Server 2005 that is installed as Photo Gallery's database engine, and that SQL Server version has not been supported for a long time. But as long as it works I guess I shouldn't complain.
It seems to put my current position as a geotag on every photo. I've never used geotags, so perhaps it does that with all photos that lack geotags. It's not good since many photos are taken on other places.
Update 2. After some hours all the people tags had been read, and all thumbails were said to be updated. Since many thumnails were still showing as grey boxes I restarted Photo Gallery, and it's "Not responding" It just says "Läser in" ("Loading..."),
and the process in not responding. I restarted the computer. The same result.
It seems I can't get Photo Gallery to work with Windows 10, even if I thought so some hours ago. It was working fine directly after the upgrade to Win10 ver 1511 and while it was still updating people tags. But not at all now. Just as before.
Update 3:
I finally got Photo Gallery from Windows Essentials 12 to work on Windows 10!
A number of questions here on the English (Indian?) answers.microsoft site led to nowhere. The Microsoft personnel just asked me to reinstall again and again.
But asking the same question on the Swedish version of these pages, the support immediately led me to a solution:
The program was (by default?) set to Compatibility mode: "Windows XP (Service Pack 3)". On the Compatibility tab of the shortcut properties for Photo Gallery, I let Windows look for a better Compatibility mode, and Windows then changed the compatibility
setting to "Windows 8". And what do you know... then it worked!
Here is a link to the Swedish page. Even if you don't know Swedish you will probably be able to "read" the pictures.
http://answers.microsoft.com/sv-se/windowslive/forum/gallery-wlinstall/photo-gallery-och-windows-10-st%C3%B6ds-inte-fullt/f825d8c0-72d3-412c-95bd-a5d1492afd0c
Just change compatibility to Windows 8 – perhaps compatibility mode isn't even needed, but obviously the Windows XP setting made it halt and fail to load.
(Another caveat can be that SQL Server 2005 CE was not installed when you installed Photo Gallery, but then you get another error. I had to download SQL Server 2005 Compact Edition manually and accept to install it despite warnings about it not being supported.
But once it was installed I've seen no problems with it.)