iTunes will not play movies I have purchased and downloaded
When trying to play movies I have purchased I get a black or multi colour fractured screen. Once the movie (eventually) starts, if it does, I am not able to have any control over iTunes or anything it is playing. I have to force the app to close to gain control (via Task Manager).
When first starting, iTunes told me that movies I have downloaded were not authorised for my PC, and I had to authorise each one individually.
iTunes and Windows updates have been done (all up to date).
I have also uninstalled Tunes and deleted movies, reinstalled and downloaded. Still will not play correctly. The movie starts then the screen goes funny or the movie stalls (on a black screen).
I now get an error message telling me the movie I select can not be played in HD. I have a new HP Envy 14 Laptop, which has the latest display technology. All updates are in place, for Windows and iTunes.
Appreciate any assistance.
Windows, Windows 10