Firstly, thanks for taking interest in this problem and trying to help out. I will ofc install DirectX 9,0c, especially since you say it mentions a problem with it and I will also try out the K-Lite codec (even if this solution seems strange since I can play all the animations separatly in their game-folder). But I will not mess with the grapic-card drivers, not for a porn-game, not even for this one.
Like most others I use this comp for so much else and those programs/games may get affected in strange ways when I open up their saves suddenly using an older driver than I had last time.