https://support.microsoft.com/en-us/kb/307729
With Windows 10 there are some differences but idea is the same.
You can use these settings to create a suitable GPO:
To disable balloon tips in the notification area, follow these steps:
- Click Start, click Run, type regedit, and then press ENTER.
- Locate the following subkey:HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced
- Right-click the right side pane, create a new DWORD value, and then name it EnableBalloonTips.
- Double-click EnableBalloonTips, and then give it a value of 0.
- Close Registry Editor.
- Log off Windows, and then log back on.