This is a known issue that may occur when you first install build 9926 of Windows 10 Technical Preview. You may find a fix for the issue by checking for Windows Updates. To do this without the Start menu:
This should bring up the Check for Updates window. Install updates.
If no update is available, or the available updates don’t resolve the issue, reboot the device. The Start menu should come back. To reboot without using the Start menu:
Hold down the Windows key and press L to Lock the device. Swipe up or press Enter to get the log in screen. Use the Power icon on the log in screen to restart the computer.
OR
Hold down the Windows key and press R to get a Command Prompt. At the prompt, type
shutdown –r to reboot the device.
You may be able to correct this by re-registering the package. Run a Powershell script using the following steps:
Press Ctrl+Alt+Del. Select Task Manager.
From the File menu, select
Run new task.
Type powershell, put a check mark next to
Create this task with administrative privileges and tap or click
OK.
Paste or type the following at the Powershell prompt, and hit Enter:
If none of these solutions are working, please check that your User Account Controls are set to the default recommended settings.You can find this control by going to Settings and searching for “User Account Control”.
Once the control page opens, set it to “Notify me only when apps try to make changes to my computer” and click
OK.
Also, make sure you’re using an administrator account, and that you are not on a child, guest or standard user account when attempting these solution steps.To check this, go to Settings > Accounts >
Other user accounts.This will list all the active users and whether they have administrator privileges.
If you’re current account is not an administrator account, you’ll need to sign out and then sign into one of the existing administrator accounts listed.From there, go back to this page, click the entry for the account you were using, click
Edit, and then switch the account to Administrator.
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