Mohamed if the hard drive has bad sectors on it is best to replace the hard drive itself. But you need to save the files first by doing so, you have to do a parallel re install. Parallel re install is like booting your hard drive with 2 operating systems for details on how to do that click on this
link.
Once you are finished try downloading and saving it on a external hard drive all the files that you saved. Purchase another hard drive and upload the files that you have saved
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