do not touch these folders or any sub-folder in the Windows directory. If you wanna clean wipe do it by clean installing 7. Other than that use the Windows DiskCleanup tool to remove slack....
My question was, and continues to be, not concerned about user files, application files, or any of that. It's just about what, if any, files and/or folders can be deleted from
windows/winxsx which is using just under 7GB
windows/installer which is using almost 5GB