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#21
C is showing files now? Backup important stuff asap.
Download partition wizard bootable ISO and burn it. Then boot from it.
Free download Magic Partition Manager Software, partition magic alternative, free partition magic, partition magic Windows 7 and server partition software - Partition Wizard Online under Free Download Bootable CD Now!
then perform a surface check: Video heop on how to perform disk surface test with Partition Wizard partition manager?
Many errors (red spots)? If so (what I expect), the disk is faulty... how old is the disk?