what OS are you using?
After reading the above you might, or might not...given the situation want to DL a free disc defrag progie. easy enough to find in a google search.
Note:You might not need it, you might not be able to use it.
Use Diskeeper defragmenter instead. I had the same problem with the built-in defragger and after several frustrating years, I finally broke down and bought Diskeeper. Big difference. And you won't have to run it in safe mode or any of that.
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