I showed in another post how to share photos, videos & album with Amazon Photo  included in an Amazon Prime subscription.

If you use Amazon Prime Music, which is another benefit for Prime customers, it may annoy you to have its desktop app starting at every PC boot. If you look in Preferences of that application, you can find an option that should disable that “feature” if unchecked.

Even if unchecked, Amazon Music application startup at every PC boot

However, even though the first option is unchecked, Amazon Music application always started at every PC boot.
Therefore I decided to disable both Amazon Music and Amazon Music Helper applications directly from the Startup tab of Task Manager (cntr + alt + del): note that, if no tabs are displayed, you need to click on the More details icon at the bottom right of the popup window.
To disable one startup application, you need to right-click on the line displaying its name and choose Disable from the menu.

To disable one startup application, you need to right-click on the line displaying its name and choose Disable from the menu.

Disable both Amazon Music and Amazon Music Helper applications from the Startup tab of Task Manager

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You may be interested to the following posts too:

• How to share photos, videos & album with Amazon Photo included in an Amazon Prime subscription
• How to stop Amazon Music from automatically be launched at PC startup you 
• Amazon Prime: di tutto e di più … e per studenti ora a prezzo scontatissimo!