Could not find C:/spel/BGII - SOA/mod_gui1.tmp Could not find C:/spel/BGII - SOA/mod_gui1.tmp Could not find C:/spel/BGII - SOA/sound.tmp
And when I start the games all the NPCs have wrong sounds.
Those files not there aren't a problem, since they were remnants of old GUI installation. As with NPCs on wrong sounds, this has been reported previously. You could try re-installation. What specific German versions of BG1 and BG2 do you have?
German versions? Actually I'm not german, even though my name may suggest so.
I'm using the Uk versions of Baldur's gate UK Release Version 1.1.4315 (NOISP) Baldur's Gate: Tales of the Sword Coast Release Version 1.3.5508 Updated with the UK5512 patch
I can find no information on which version of SOA I have. But it is standard UK-English version or something. Baldur's Gate II: Throne of Bhaal Release Version 2.5.26461 Updated with 26498 English patch.