I've updated tages numerous times with no success, and removed both DT and Alcohol, i've even went into the registry to remove every key left by those programs, with no success. Here are some topics from the official forums:
http://www.thewitcher.com/forum/index.php?topic=2507.0
http://www.thewitcher.com/forum/index.php?topic=5244.0
http://www.thewitcher.com/forum/index.php?topic=4002.0