Best posts made by AlphaLegionist
I had earlier mentionted well-known "AC logo freeze" problem.
For me, it helped that I moved sounddata and videos folder to drive C and make a symbolic links to game folder on my other drive AND (!) please remeber that as @HisN said, UBI for some unknown reason does not 'like' folders with spaces or " ' " ( single quote ) mark with path name. So make sure both your gamefolder and path to moved sounddata and videos folder does not contain spaces or single quote mark.
Let me know if this helps.
Taking into account my case, you probably do not have to reinstall game to C drive. Moreover it should be enough just to rename gamefolder or move it. In my case my original path was like: [disc]:\Ubisoft Game Launcher\Assassin's Creed Vallhala and I moved my game folder to [disc]:\Valhalla. Ubi connect should ask you for game path and everything should be ok.