Q: My purchaised movies doesn't playing

Hello Taras99,

If you are getting inconsistent playback of movies purchased from iTunes, then take a look at the article below to check the settings on your computer to ensure that nothing is causing an issue. You may also want to delete the movie that is giving you trouble and download it again. 

Troubleshooting iTunes for Windows Vista or Windows 7 video playback performance issues

http://support.apple.com/en-us/HT203205

How to delete content you've downloaded from the iTunes Store, App Store, iBooks Store, or Mac App Store

http://support.apple.com/en-us/HT5772

Download past purchases

http://support.apple.com/en-us/ht2519

Regards,

-Norm G.