The manifest files that define assembly dependencies are XML-based. If one of these files becomes corrupted—having incorrect syntax, missing closing tags, or binary errors—the Windows loader will fail to parse it, triggering the SxS error. One user reported the exact issue: "Error in manifest or policy file...Invalid Xml syntax" .
If you are working with professional video equipment, "SxS" refers to the Sony SxS memory card Compatibility
Create a workspace directory (e.g., C:\mount ) and extract your Windows 8 install.wim file to an accessible directory. Open an elevated command prompt and mount the image:
This command forces Windows 8 to look at its internal secure manifest database, pull correct versions of the 64-bit binaries, and overwrite the damaged files in the storage system.