Welcome to the community. I'm sorry to hear about the Assasin's creed issue and we want to investigate this for you. May I please know what you did in the Intel XTU that temporarily solved the issue for a few minutes? Additionally, would you send us the SSU logs of your system so we can be more familiar with your configuration. You may download it at this link: -system-support-utility-for-windows.html. Are there also other games affected as well aside from Assasin's Creed? I'll be waiting for your reply.
Assassin's Creed hasn't been a game about a group of assassins following a creed and striking from the shadows for a long time. Here I would say that Basim, protagonist of Assassin's Creed Mirage kicks down the door and kills everyone in the room, except this new entry in the series is smaller, more focused, and once again concerned largely with stealth, and is all the better for it. So it's more appropriate to say Basim snuck in through an open window and is choking everyone out one by one.
Basim appeared in huge-mapped Viking romp Assassin's Creed Valhalla as an ultimately quite important supporting character. He has a part in AC's larger framing involving super-advanced transhuman beings and genetic memories, but that is unimportant to Mirage (and arguably the series in general, but that's by the by). Mirage tells the story of a younger Basim, a street thief who joins the Hidden Ones after a contract to steal a mysterious artefact goes awry, and his found family of tiny orphans is murdered. The plot follows Basim's rise though the ranks of the assassins, working with outside groups and thinking about the nature of freedom as they liberate 9th Century Baghdad by stabbing a pyramid of increasingly evil people, against a backdrop of extreme political instability.
This is, broadly speaking, the plot of most Assassin's Creed games, and Basim is an able enough main character to carry it. He's extremely dedicated to the creed, bless him. Mirage's smaller size really helps focus the plot, though, as it does everything. Because all this is taking place in one city, it's much easier to track the key players than on a map that takes up half a country; you can remember that this freedom fighter is kind of a showy PR guy even if he's your ally, that the academic burned the books at the library to cover up stealing one in particular, and that the doctor performing experiments on patients is a nervy piece of shit. You can drop some threads of an investigation if you want to pick up a different, interesting one on the other side of the city, without fear that you'll forget what else is going on.