I am trying to install SQL Server SP1 Express on a fresh windows 10.0.10240.  I've tried several times.  In the last attempt, I changed the SQL Server Engine's login to SYSTEM, but to no avail.
The installer returns this error:
"SQL Server 2014 SP1 Express Installer Error Msg: Could not find the Database Engine startup handle."
This just means that the main engine service will not start.  There is more than one possible cause for this.
The relevant event log entry is: "Cannot use file 'C:\Program Files\Microsoft SQL Server\MSSQL12.X2014\MSSQL\Template Data\master.mdf' because it was originally formatted with sector size 4096 and is now on a volume with sector size 3072. Move the file to a volume with a sector size that is the same as or smaller than the original sector size."
Sometimes, it is a bad user account being used by the service that prevents the main engine service from starting ...

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