Can I Disable “Windows Shell Experience Host?”
No, you can’t disable “Windows Shell Experience Host”, and you shouldn’t anyway. It’s an important part of delivering the visuals you see in Windows 10
Windows Setup will automatically create the 4 partitions below on the drive, and install Windows 10 on the primary partition.
Partition 1 - Recovery
Partition 2 - System - The EFI System partition that contains the NTLDR, HAL, Boot.txt, and other files that are needed to boot the system, such as drivers.
Partition 3 - MSR - The Microsoft Reserved (MSR) partition that reserves space on each disk drive for subsequent use by operating system software.
Partition 4 - Primary - Where Windows is to be installed to.
http://superuser.com/questions/743659/what-is-msr-partitionThe Microsoft Reserved Partition (MSR) reserves space on each disk drive for subsequent use by operating system software. GPT disks do not allow hidden sectors. Software components that formerly used hidden sectors now allocate portions of the MSR for component-specific partitions.