thank you very much for your fast response!
I think that'll help me further.

Although I made already renders with dynamic clothes (why do the textures coming with them have to be that giant???) without that issue, I guess this time I probably just had too much textures in that single scene for my poor computer :) 

PS.: Cause DS just didn't anything at all at the end, not saving, not opening not anything...I reinstalled it in the meantime :) ... I now try again with fewer stuff combined with my dynamics and see how it works.

PPS.: 
.... it renders :) 

and now I'm going to edit all that wallpaper textures,.... :) 

Thanks again for your help!