zmazat ho, je z principu nezmysel vid:

All of the components in the operating system are found in the WinSxS folder – in fact we call this location the component store. Each component has a unique name that includes the version, language, and processor architecture that it was built for. The WinSxS folder is the only location that the component is found on the system, all other instances of the files that you see on the system are “projected” by hard linking from the component store.

viac:
What is the WINSXS directory in Windows 2008 and Windows Vista and why is it so large?