Windows NTFS Compression and Native Boot VHD/ VHDX? Issues or Conflicts? I am currently cleaning out my Windows 7 x64 Ultimate SP1 for a 2 step upgrade > Win 8 > Win 8.1 and then will convert it to VHD. I have this \Windows\Installer folder that is taking a lot of space and seems to be unused mostly. Eventually, I wish to clean it out/ delete it or major stuff inside it. But, till then I was considering "compressing" option it as suggested here instead of delete/ remap right now. http://superuser.com/questions/23479/is-it-safe-to-delete-from-c-windows-installer http://superu