So I hope anyone out there had the same problem and found a way to fix it: The guy from MadCatz support said, because the X52 works on my old system, they can't help me.
I used this stick on my old rig, and after some research I finally found a way to install this weird software successful, but all those hints didn't work on my new rig. I'm sorry to ask so many questions, but I tried a lot to install my Saitek X52 Pro again, but without success