So uh, now it works. My screen went black and came back but I could only select 30hz. So I decided to reinstall everything nvidia, nvidia-dkms, nvidia-utils, lib32-nvidia-utils and opencl-nvidia.
After this magically Sims 1 and 2 work! I have tried to get old games to work since October, and I am sure I did this already before, but somehow it now works.
Thanks for everyones help!
Soo… where do we go now? What open source alternative exists that is on the side of its users?