andre0799: When I reinstalled I got an error right after the game updated by itself(that is right after the installation is over) saying "Installed game version is invalid or incomplete".
sounds like it downloaded and tried to update patch 1.1 but failed
did you restart your computer after uninstalling, before you did the install?
also if you try to install again, move your savegames to a safe place, then clear the all the Witcher 2 stuff where the savegames are. you can also try removing everything where the game installed the game after you uninstall, so no old files remain there