Hello again everyone.
I’m writing this reply just to say I “solved” the problem (if what I did can be defined as “Solution”).
After trying tons of solutions I saw in different sites, I ended up breaking my computer even more (touching registers, installing/uninstalling programs…), and things that runned fine before now didn’t even open. So, after consulting to some friends too, I realized/decided that the best thing was to do a clean Windows 11 reinstallation and hope for the best.
I performed a clean Windows 11 reinstallation, and after installing all the drivers and Windows updates, the first thing I did was install Unreal, JUST Unreal, in case something I had before was blocking Unreal somehow. It ran perfectly. I made I backup of the system and started downloading my things bit by bit, always ensuring Unreal opens after any installation. I don’t know what was the real cause of my Unreal crash, but at least now works perfectly.
As last message, I want to apologize if you came here looking for the crash solution and found this instead, as obviously reinstalling Windows cleanly is not a comfortable solution, or even a solution, because I don’t guarentee that doing it will make your Unreal run. Oh, and thank you very much to the ones that tried to help me!