Possible Duplicate:
Why does the /winsxs folder grow so large, and can it be made smaller?
I want to free some space from C drive... when I checked which folder holding more from Tree size Free tool, I found following location is holding more data? Is it safe to delete those folders?
and
No!
The winsxs folder is used for keeping previous versions of files that are replaced during setups. For example, in previous versions of Windows, if you installed an application that required changing abc.dll, it would just do it. In Windows Vista and 7 it will keep a copy of the original and changed abc.dll and keep a version in winsxs so that each application can keep its own version.
You shouldn't mess with the contents of winsxs under any circumstances.
See this blog post to get an understanding of what it's for.
Don't delete system32 - it's essential to the operation of Windows. This page sums it up nicely.
Basically, System32 is a directory that is required on any Microsoft Windows system. So, if you use Windows, you've got to have System32 working in order for your computer to run properly.
Generally speaking, you shouldn't mess with anything inside the Windows folder unless you really know what you're doing.
You can get a 500 GB hard drive for fifty bucks US on sale. Add storage--hardware is super-cheap these days and it's really dangerous to screw around with the Windows folder.
Do not manually delete any winsxs contents. However you can use cleanup tool which will remove stuff no longer needed if you don't intend to uninstall SP1 or SP2.
Do not delete this folder is for dll copies
The answer seems to be "no"!
You'd be better off using clean up tools like ccleaner, eusing or glaryutilities. And get an external drive for when your machine gets full and for back ups.
