Never mind, people, I managed to figure it out (you guys were correct on the lack of RAM... after all the object spacing was 10, and the population area 100,000 x 100,000).
LOL, not even my 4 GBs of RAM (3 GB-usage, due to Vista) are suffiecient for such fine numbers.
Anyways, I set the object spacing to 100, that seemed to solve all my problems. I am
very happy now!