A quick fix to the StartMenu issue in Windows 10 Technical Preview Build 9926

During deployment of your Windows 10 image, you can fix this issue by prepping the default user profile, so that all users logging on to the device will benefit from the fix.

In the registry key HKEY_USERS\.Default\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced

Create a REG_DWORD with the name EnableXamlStartMenu

Set the value to 0 (zero)

Or simply use this command to do it during a Task Sequence

reg.exe add hku\.Default\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced /v EnableXamlStartMenu /t REG_DWORD /d 0 /f