Last week I upgraded from a clean Windows 8.1 Pro to Windows 10 Pro (64 bit). Immediately after the upgrade I did a Windows Reset to get the clean install feeling. Unfortunately my Start Menu is opening very slow (takes 2 full seconds), and Cortana isn't working. The search bar is in the task bar, but I cannot type in it or anything. I'm currently at build 10240.

After searching on the internet, I did attempt to re-register all packages:

Get-AppXPackage -AllUsers | Foreach {Add-AppxPackage -DisableDevelopmentMode -Register "$($_.InstallLocation)\AppXManifest.xml"}

Unfortunately, this did not help. Every time I open the Start Menu, two errors show up in the event log:

Faulting application name: SearchUI.exe, version: 10.0.10240.16384, time stamp: 0x559f3d35
Faulting module name: SearchUI.exe, version: 10.0.10240.16384, time stamp: 0x559f3d35
Exception code: 0xc000027b
Fault offset: 0x00000000001423c2
Faulting process id: 0x1468
Faulting application start time: 0x01d0d02f71fa36be
Faulting application path: C:\Windows\SystemApps\Microsoft.Windows.Cortana_cw5n1h2txyewy\SearchUI.exe
Faulting module path: C:\Windows\SystemApps\Microsoft.Windows.Cortana_cw5n1h2txyewy\SearchUI.exe
Report Id: 5de0ff92-30e9-4e39-a8b4-3798d067c3df
Faulting package full name: Microsoft.Windows.Cortana_1.4.8.152_neutral_neutral_cw5n1h2txyewy
Faulting package-relative application ID: CortanaUI


Activation of app Microsoft.Windows.Cortana_cw5n1h2txyewy!CortanaUI failed with error: The remote procedure call failed. See the Microsoft-Windows-TWinUI/Operational log for additional information.

The TWinUI log shows the following:

Activation of the app Microsoft.Windows.Cortana_cw5n1h2txyewy!CortanaUI for the Windows.Launch contract failed with error: The remote procedure call failed..

SearchUI.exe in the Cortana folder is V2, datestamp ‎Friday, ‎July ‎10, ‎2015 6:57:17 AM. File version 10.0.10240.16384 KB3081424 fails to install with error code 0x80070bc9. Any suggestions on where to search next to get Cortana working?

  • What do you mean by build 10240? while some people say that was what was releaced, some people said it was terribly buggy. Did you pick up a nice clean copy of the relaaced one from microsoft? (or even from any other source, where it was the releaced one, and you know that there is no file corruption?)
    – Psycogeek
    Aug 6, 2015 at 10:41
  • 1
    Build 10240 is what I get when I type "ver" on a command line. It's the version that came with the GWX app from Windows Update on Windows 8.1. Installation went without any issues, and the Windows Reset also gave no issues. Just found out that KB3081424 doesnt want to install. (err 0x80070bc9)
    – Master-Guy
    Aug 6, 2015 at 10:55
  • @Psycogeek - What? The build released to the general public was build 10240 what is confusing about that?
    – Ramhound
    Aug 6, 2015 at 10:56
  • Because there are different versions of the searchUI. He has some faulting going on with that , and it could be more than a cortana problem , so what version of searchUI.exe do you show in windows 10? and why is there a 10.0.10240.16401 and a 10.0.10240.16384 , I dont know?
    – Psycogeek
    Aug 6, 2015 at 11:23
  • SearchUI.exe in the Cortana folder is V2, datestamp ‎Friday, ‎July ‎10, ‎2015 6:57:17 AM. File version 10.0.10240.16384
    – Master-Guy
    Aug 6, 2015 at 11:27

1 Answer 1


I had this problem also. To fix it I had to go to the folder:

C:\Users\%USERNAME%\AppData\Local\Temporary Internet Files\

right click, properties, security tab, add the group "all application packages" and give that group full control. once i did that i could get into all of my metro apps again.

  • 1
    Don't you think that this could be a security concern for the user? Sep 5, 2015 at 19:28
  • This did not work for me, but lead me to try applying the change to all of %AppData% for the user which fixed it! Dec 15, 2017 at 19:15

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