Try using System Restore to return your PC to an earlier restore point when it was able to defragmentize. Then try to see if you can defrag it at that point. It that does'nt work then try to go into safe mode and select the 'last known good configuration' option and then go back into Windows and try to see if you can defrag. Another method you can try is to clean out your registry,delete all your cookies and temp files and then reboot your pc. When you return to Windows after rebooting, try to see if you can defrag your drive.
If none of the above methods work, then your hard drive may need to be reformatted. Before you try to run Defrag you need to have at least 15 percent available space on your drive. Given the size of drives these days that seems excessive to me but there are the rules dictated by the OS.Alternately there are some free tools for download (Avast NTFS4DOS) that can be bundled onto a DOS boot disk that will read and defrag NTFS partitions. You might need to be a little dexterous with DOS commands to do this but it isn't too hard.
This doesn't demand the 15 percent overhead to operate.Good luck. Assuming you do not have disk hardware problems or directory issues (ie: found by running 'chkdsk /f' as discussed by others).Some things you should know about the way (Microsofts and many other) 'Defrag' utilities work:1. You must have 15-20% of your disk drive free (defraggers try to copy files that are split into single files or at least larger peices). To do so they must have (bigger) space on the disk to put the new files in.2. Defraggers usually detect each time a disk file is 'touched' (updated) and re-start their analyize routine thinking you changed the files size (thus 'moved') the file.3.
Founded in 1981, Diskeeper Corporation is the technology innovator in performance and reliability technologies. The company’s products make computer systems faster, more reliable, longer lived and energy efficient, all with zero overhead. Inventors of the first automatic defragmentation in 1986, Diskeeper pioneered a new breakthrough technology in 2009 that actually prevents fragmentation. I know, I know if you're running Windows 7 or Server 2008, this is already taken care of by a Microsoft defined scheduled task. But if you're not, then this script can be.
![Defrag Defrag](https://www.winhelp.us/images/windows/defraggler/defraggler.use07.jpg)
Screen savers, anti-virus, firewall utilities often 'touch' their log files every 5 seconds or so (ie: each time a program (ie: defrag) starts your anti-virus should scan the program record the scan results in its log).3. This updating of logs, etc., can put defrag into an endless loop of re-starting/re-looking for files that need defragging (re-analyizing the disk directory). It never gets time to actually do any defragging.Thus. For defrag to work (and get anything done) you need to free up some disk space & shut down everything else as much as possible. Ie: take your PC off-line (unplug phone/cable/DSL), shut down your Anti-virus & firewall and then start the defrag utility.Some other vendors defrag utilities do not have the same issues with always re-analysizing but the windows defrag will work and does so safely when given the chance.Good luck,Goodtime Charlie, VA.
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