Fix 1: I suggest you to restart the PC in troubleshooting mode. Press Windows button and L key. And this will log out from your session. Now go to the Power icon and select restart. Here you can choose troubleshoot option. And from this option you can point to "Reset". You should also choose "Keep my files". So there is no loss of personal data.
This small fix is going to temporary fix the start menu. Do note that updating the Windows 10 will fix any such issues that have caused since the release.
Hope this works in your case.
The much-loved feature made a welcome return in Windows 10 but freezes and other issues have been reported by a number of users. If you're experiencing one of these bugs, try the solutions we've set out below and hopefully your Start Menu will be up and running like normal again.
Check and repair corrupt Windows files
Windows files can sometimes become corrupt and this can wreak havoc on your PC — including a stuck Start menu. Fortunately, Windows 10 has a built-in way of resolving this.
1. Launch Task manager
Press the [Ctrl] + [Alt] + [Del] keys on your keyboard at the same time - alternatively, right click the Taskbar. Then select Task manager.
2. Run a new Windows task
When the Task manager window opens, click the More details option to expand it, then select Run new task from the File menu.
3. Run Windows PowerShell
When the Run new task dialog box opens, type powershell, tick the box for Create this task with administrative privileges and click OK.
4. Run the System File Checker
Type sfc /scannow into the window and press the [Return] key. The scan may take some time and will end with one of three results. Windows did not find any integrity violations and Windows Resource Protection found corrupt files and repaired them mean there are now no corrupt files, but Windows Resource Protection found corrupt files but was unable to fix some (or all) of them indicates a problem.
In this latter case, type (or copy and paste) DISM /Online /Cleanup-Image /RestoreHealth into the PowerShell window and press the [Return] key. This will download files from Windows Update to replace the corrupt ones and, again, this may take some time.
Reinstall all Windows apps
Downloading and reinstalling all Windows 10 apps reportedly fixes a stuck Start menu. This isn't as drastic as it sounds — 'Windows apps' are the ones built into Windows 10 and available from the Windows Store. They used to be called 'Modern' apps and, before that, 'Metro' — Microsoft just changed the name with Windows 10.
Better still, the reinstallation is automatic and should only take a few minutes. The process might delete any data you have saved in these Windows apps, though, so backup anything important before you begin.
Apps that store data online, in Microsoft OneDrive or as files in a separate folder (such as the Photos app) should be unaffected.
Warning: Recent reports indicate that this process may cause some Windows Store apps to stop working, so be mindful of this before continuing. I hope this information can help you and if you need further information about the Windows 10 you can visit this site www.impkeys.com have a great day ;)
Knowledge is power.