got 2 options :
1 Wait for a fix or something, i doubt it xD
2 Get your money back and wait for a solution, If no solution appears buy another game,
u'll be sure to play smoothly with high settings.
Welcome to the forum.
AFAIK there is a new patch to be released soon that will get over those problems. I also think that the english version doesnt have the latest patch installed (wich is only available in german i think), thus accounting for the major complains around.
Shame Larian had to release the english version like this, dunno if it was a distributor fault or pressure to release earlier than larian was ready, or if it was larian that was late on the release of the "fix-it" patch.
