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how much free space is on the drive, if it does not have much or any a defrag will not run because it does not have the room to move the files. if you have enough space left, can you access the files? if so can you move them to another drive and reformat the drive because it may have file system errors, bad partition information or bad sectors. if the format runs and gives no errors put your stuff back on and see if you are good to go.
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