The Sims 2: can't build walls and more

[KNBR]

I have some problems with sims 2. They game proballly is runnig, but i can't make floors, windows, walls, doors, pools etc. I also can buy furniture and play normally. Why can't i make new houses. Can you help me? Have i got the wrong crack? Which crack do you use? Have anybody the same problems and what can i do that i can create houses? Thank you for your answer