This mentions Vista but it might be relevant.
Windows 8 Pro 64-bit Optimization always leaves 18% fragmented
Cannot defrag my computer since installing Windows 8.1?
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Anonymous
Norton 360 says I need to optimize my C drive.
When I try - It does not complete the process.
Remains 12% fragmented.
Any suggestions on how to fix this.
Worked fine initially when Windows 8.1 and Norton 360 was installed.
Has been a problem for about a week.
Windows for home | Previous Windows versions | Performance and system failures
Locked Question. This question was migrated from the Microsoft Support Community. You can vote on whether it's helpful, but you can't add comments or replies or follow the question.
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Anonymous
2015-05-23T04:37:41+00:00 -
Anonymous
2015-05-23T03:09:14+00:00 i defrag my pc when its at 18% fragmented and an hour later its back at 18% fragmented. Can me using my pc a lot cause this
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Anonymous
2014-03-15T20:02:16+00:00 There is some mention in this long post that running any Defrag actual causes the built in Windows Defrag to start working correctly. Therefor if we can get one type of Defrag to work it "might" fix the problem with the Windows Defrag and allow for its' normal running. Of course it might not work but a Forum is a good place to suggest possible solutions like this rather than keeping it to ones self.
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Anonymous
2014-03-15T19:14:27+00:00 Why should it be necessary to do it that way? Sorry, but this answer gives no insight into what the problem is, or how to fix it.