You can solve this problem by extending System Reserved partition in Windows 10/8/7. When you upgrade Windows 7/8 to Windows 10, original System Reserved partition is too small. The System Reserved partition consumes 100 MB of space on Windows 7, 350 MB of space on Windows 8, and 500 MB of space on Windows 10.
When upgrading from Windows 7/8 to Windows 10, or updating Windows 10/8/7, you might encounter the error ' We couldn't update system reserved partition', error code 0xc1900104, or error code 0x800f0922. This is because: In general, you don't need to care about the System Reserved partition.
