Okay.. so suddenly I cant hear conversations or any character voices in game. All the other sounds and music work. They worked fine before. I uninstalled 3dvision drivers so could that be the reason? Seems kinda odd if so...

Its a known problem by now with certain sound cards or headset like G35 that uses 7.1.

If you have the option to change to 5.1, thats your fix.

Couple of topics on the issue.
http://www.gog.com/en/forum/the_witcher_2/voices_have_disappeared/page1
http://www.gog.com/en/forum/the_witcher_2/no_sound/page4
http://www.gog.com/en/forum/the_witcher_2/g35_support

http://segmentnext.com/2011/05/18/the-witcher-2-crashes-fps-fix-sli-fix-ati-graphics-nvidia-performance-no-sound-errors-and-fixes/

Hm, nice. Got Asus Xonar and surround setup so thats it. I really hope they fix this soon...

edit. none of thsoe seems to work for me and now also my graphics settings are default and wont go back to my own settings.