Take screenshots of all your installed programs and post them here . If you don`t feel comfortable making them public feel free to email them to me . Be sure and add your username if emailing .
Also may look here for possible solutions
http://en.thewitcher.com/forum/index.php?/topic/26411-additional-fixes-for-21-and-tw2ee-issues-and-142-error-or-witcher-2-stopped-working/