Windows Startup sound is part of Windows startup process.This sound can be useful for troubleshooting startup problems because it indicates whether you have reached a specific startup phase. If you prefer, you can disable the startup sound by following these steps:

Step I - Click on the Start Button and type in Control Panel and hit Enter.

Step II - In Control Panel, click Hardware And Sound.

Step III - Click Change System Sounds.

Step IV - On the Sounds tab, clear the Play Windows Startup Sound check box. Click OK.