So you’ve been taking a look at what’s eating your hard drive space with WinDirStat or TreeSizeFree or similar and have spotted the C:\Windows\Winsxs folder.
Winsxs stands for Windows Side by Side and is basically where Windows keeps multiple versions of the same .dll’s to allow multiple applications to run without any compatibility problems. If you browse it you’ll see what looks like a lot of duplicate .dll files. I’m not going to go into the in’s and out’s of it here as there are plenty of good run through pages on the web.
What I will do is give you the easy and safe way to clear it down.
From the C:\Windows\System32 folder run:
DISM /online /Cleanup-Image /SpSuperseded
This blog was copied from: http://sysbadmin.wordpress.com/2012/10/14/how-to-clean-up-cwindowswinsxs/