This post is a quick one on WinSXS cleanup, and it works (for me).
None of the instructions I found online helped me, including the KB2852386 fix on Windows update.
Try this:
Go to C:\Windows\system32
Right click on cleanmgr.exe and Run As Administrator
Now, the relevant "Windows Update Cleanup" option and another for cleaning up Service Pack backups should appear. Tick them both
Proceed!
For me this worked a treat for WinSXS cleanup. Read more [...]