please make the game start under winxp again. since 2.1 it won`t work anymore.
I found a workaround in the net. it is sad!

the problem is this file : newnetworkclient.dll ! and of course the witcher2.exe . :-(

Um... did you try this: http://en.thewitcher.com/forum/index.php?/topic/30215-hotfix-for-net-4-related-errors-0xc0000005-0xc0000142-etc/?

The game runs fine on XP. I know this because I run it on XP.

thanks 227. It works! :-)