Hi User,

May I know whether the user has installed the latest windows updates on Windows 7? If not, this will be the first thing he can try.

If the user has already installed the latest windows updates. Another thing he can try is by using different browsers.

If the emojis are still not showing, there are some alternatives in these links that provide workarounds to display unicode emoji. However, we cannot guarantee whether any of these will work because we do not have a Windows 7 machine to test.
https://superuser.com/questions/1094188/how-do-i-display-the-latest-unicode-characters-esp-emoji-in-windows-browsers
https://superuser.com/questions/1094634/smileys-emoticons-missing-in-windows-7