When i updated my computer to Windows 8.1 and want to startup Itunes, i got an very nasty error! So after some searching it’s pretty easy to fix. So i thought maybe you have the same problem. That’s why i publish the solution here 🙂
Hope you can fix yours to with this easy fix:
Copy QTMovieWin.dll from: C:Program Files (x86)Common FilesAppleApple Application Support to: C:Program Files (x86)iTunes Now you’re error would be fixed.