Juhu !Now the Installation has been started over the error! I extracted the TWEE_Upgrade.exe as desripted above in Safemode (For the 1.st try without Removal of KAV Files - I have only the Kaspersky Antivirus, not the Internet Security Version). By the way there comes an "unexpected error in next file header, possibly file corrupd" but all files have correct MD5 checksums as posted here on the board. Extracting went on after this message and after rebooting the system in normal mode the Installtion started after closing Kaspersky (before closing it meant, thatthe game is not activated but activation in game is already greyed out)How long will the patch Installation go?... Hmm. Patcher Message says aproximately 2 Hours - First Part is already done, now it installs the language packs ...... And is ready now! I will make a copy of the full witcher folder and then start the Game...Thanks Guy for all your Help - but now the game crashes when it starts back to windows desktop.I have no more patience with that shit - a whole weekend of trouble for this buggy patch on an correct & legal operating system with newest service pack, firewall and antivirus software, actuall drivers an so on and for what? In other games i could see the ending sequence now, but this won't ever start one times ... this is too much.