There could be some corrupt harddrive blocks. If you can do that without deleting something important (or after an backup) you can try to re-format the harddrive, or at least the partition where your debian's going to. You can do that from a bootable CD (like DEbian Installer #1), or a preinstalled windows, for that. Note this is about new formatting, erasing the disk. It has nothing to do with putting a filesystem. Reformatting isloates and excludes bad blocks from the beginning.
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