Hello alexeyfromklimovsk,
We're here to help with the issue you're experiencing in iTunes. We understand your purchased movies have no audio in iTunes on your Windows computer. We'd like to ask some questions that can help us better understand and isolate the issue.
Are the movies experiencing the issue all purchased from iTunes? If so, have you tried deleting and re-downloading your purchases? If not, check the "How to Redownload TV shows and movies in iTunes for Windows" section of this resource for steps redownload your movies: Redownload TV shows and movies in the Apple TV app
If the issue persists, does audio work if you play other content like music in iTunes?
Outside of this issue, is audio working on your computer when you play music or watch a video while browsing the web?
If the issue is isolated to the movies you purchased in iTunes, we recommend contacting Apple Support for content related issues: Contact Apple Support
If audio is not working on your computer, then we recommend reaching out to Microsoft's support team to get it resolved.
Thank you!