Sorry, should have reported that too: Gruftikus' tool is working perfectly fine now. As my game PC is up and running again, I can generate the whole Tamriel LOD now whitout problems. Except the time, last's some hours, but results are gorgeous.
Anyway I would like to try out that OBGE thing too. Already tried Liquid Water some time ago, but only managed to let all water disappear back then . Which might have had other reasons, had some bad settings in my Oblivion.ini that let the game crash quite often too. After I've fixed that in the mean time, I wanted to try OBGE v3 and Liquid Water again anyway, any hint for a good installation guide? Edit: should have tried it first, this setup's are perfect, no need for any guide, thanks a lot!