I am just adding a summary based on my own experience. Augusto's answer works for me. Just reinstall cortana. Go to powershell and type Get-AppXPackage -Name Microsoft.Windows.Cortana | Foreach {Add-AppxPackage -DisableDevelopmentMode -Register "$($_.InstallLocation)\AppXManifest.xml"} I am also using one of the comment as another answer in case that didn't work for you. I found that if you go to `C:\ProgramData\Microsoft\Windows\Start Menu\Programs` and open the shortcut "Search", it opens the "Search Everywhere" feature from Win 8, and there all the apps appear, so it has to be a bug in the new search UI of win 10, and not in the indexing options. I just wish that "win + s" could open "Search Everywhere" instead of Cortana. – Augusto Barreto Aug 11 at 17:52 That is written by augusto again. BOTH of this works for me. I did rebuilding index and other solutions. That didn't work or only work temporarily. Thanks Augusto. I think I should add my own answer so everybody knows which solutions work in my case and probably on their cases either.