My computer is in the verge of 0 bytes, and the reason is because of winsxs. Now, I already asked about this issue this last month, and I read that there was a Windows update made for it, codenamed KB2852386.
The thing is that there is a new option call Windows Update Cleanup, cleaning up any unnecessary files. I realized that it was in my system all along! (as an optional update) Trouble is after the update when I open the Disk Cleanup, the option wasn't there!