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    Bear in mind that WinSxS on Vista is the original location of any system files. Everything that is somewhere else just happens to be a hardlink into WinSxS. So unless your tool counts hardlinks to the same file just once you are likely off by around 100 % with the size :-)
    – Joey
    Commented Sep 4, 2009 at 5:29
  • Following the point about removing old checkpoints, you can also reduce the amount of space for checkpoints so that the drive doesn't fill up again. I'd suggest a minimum of 1GB- that'll be maybe 1 or 2 checkpoints (I'm happy to be corrected on that point.) Commented Sep 4, 2009 at 8:00
  • If you want a good count of how big your windows directory is really using taking the hardlinks in to account use DiskUsage in the sysinternals suite. For example for me the properties menu reported 39.1 GiB used and du reported 35.7 GiB not re-counting hard links. Commented Sep 15, 2013 at 20:32