Hey Sparrownightmare :o)

Thanks so much for your detailed reply!
At this moment, I finally finished the scene I was working on and it rendered! What seemed to cause the problem was the replicator with the ocean, and the ocean had too high settings (1024 x 1024). Since I lowered the ocean quality to 512 x 512, reduced the number of objects to 10 and 15 (before I had 30 and 35 objects) and simply stretched the replicator on x and y axis it worked.
And you're definitely right with the poser-figures. So I started to create my poser-figures in a separate scene, saved them as new objects in Carrara and then imported them iso importing several car-files with my necessary poser-figures (whihch seemed to cause trouble, too).

Regarding my PC-components, I hope working will speed up when I upgade in a few days to 4 GB of RAM iso the 2GB that I have right now.
Oh and do you really mean that it's better if the system handles the swap-file? Cause at the moment I set it to a range from min. 2046 MB to max. 4092MB (and a separate HDD for the swap-file of 8 GB).

Again, thanks a lot for all your help!!!!

~Sassy~