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Go to [Start Menu] > [Computer Management].
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Go to [Disk Management]. Notice you have [Unallocated space] for your disk.
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Right click on the [C:] drive and choose [Extend Volume].
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Click [Next].
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Click [Next]. Note: The [Select the amount of Space in MB:] should match the [Maximum available space in MB:] to utilize all the unallocated disk space.
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Click [Finish].
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Done. You have extended the disk to utilize all available disk space.