Disc or Steam? Also, GR has a force-on-start resolution of 640x480, which some recent systems won't even try to do anymore, and this could be the problem you're having. I don't have any help for you, unfortunately, and I can't say this is the problem you're having.
I moved everything listed, executables, etc. but you are on the correct path. I did get an OSD during my GR startup, so I have no idea if the .dll's will be enough, but it's not like it's complex from there.
Not precisely. That package contains a folder, which has several files in it. The files in the folder need to be extracted to GR's root directory, not the parent folder of the "mod". Then, with the files moved, you do not need to do anything else to enable this.
The "mod" is a folder called "FXAAENBmotionblur", which I extracted the contents of the folder to my root GR installation. Not the mod folder itself, just the contents. After a quick revert of my previously modified options.xml file (I had changed the full screen settings from TRUE to FALSE prior) everything worked without any need for input, just launching GhostRecon.exe
Forget the OS. It's the type of install you do that's important, and this affects any upgrade capable OS.
You can upgrade Windows, from basically any recent version to any newer version, and all that does is update your OS to the newer sort, sort of like installing a Service Pack. If you choose to upgrade, it overwrites your OS files, updates some settings, but touches few other files.
A clean install wipes the drive/partition the OS is on, and installs the OS with no concern for existing data, which is erased during the install. This means no programs, drivers, etc. but also means the OS doesn't have years of prior modifications to deal with.
So, if you choose the Window Update "upgrade" to Windows 10, you get an upgrade, which keeps as many of your existing files and settings as it can. If you go for a "clean install", you must use the "media creation tool" (Google it) and either have a serial key, or (I understand) upgrade first, then clean install.
That being said, I think you are right, though misunderstanding the differences.
It depends on if you choose to upgrade or clean install, in a sense. Either will leave your secondary hard drive intact, but an upgrade will both not wipe your OS drive, but leave (barring issue) your programs and preferences intact, on both drives. A clean install will wipe the OS drive, but also any ties from your OS to the second drive. It will be just files, readable, but with no ties to any programs except defaults.
I'll confirm that research indicates error 25 is a mis-attached keyboard, likely plugged in incorrectly while moving or cleaning it. As above, that would be the first thing to check. Plugged in correctly, try another first.
The obvious choice is an empty or dead black cartridge, where dark printing that looks black may work, but there's no actual black. Unfortunately, I don't know of a way to check a cartridge without replacing it.
I did have Tapatalk installed here (and elsewhere using closely related technology) but for some reason I can't solve or afford professional aid, Tapatalk creates a fundamental issue here, well beyond anything manageable.
Without detail, the last time we tried Tapatalk here, it took almost two weeks before we recovered back to the start.