Before we fix it, let’s diagnose it. The Start Menu in Windows 10 is technically a modern "Universal App" (called ShellExperienceHost.exe ). Unlike the simple menu in Windows 7, this one relies on your graphics driver, input devices, and system files.
This will eliminate the problem entirely, as you are getting a fresh copy of Windows. start menu keeps popping up windows 10
If the Start Menu keeps popping up randomly without any key presses, Windows system files are likely rotten. Before we fix it, let’s diagnose it