ok first the standard questions:
do you have XP or Vista?
what expansion packs do you have?
How much RAM?
Have you updated DirectX?
and how much memory does your video card have?
I have Windows XP.
I have University, Nightlife, Open for Business, Pets, Seasons, Bon Voyage, Free Time and Appartmentlife. I think that the problems started after I patched Appartmentlife.
I have at the moment 1 GB of Ram, on the back of the Appartment Life box said that that was needed.
DirectX has been updated.
My videocard has 512 MB memory.