Sounds like you may have some bad sectors on your disk. I would run fdisk, delete any partitions, then create one or more partitions, format each partition. Run scandisk from a boot disk and see if you have any bad sectors. It will take a while to do a full scan of your drive. After you are done set your machine to boot off of the cd. Win2k will give you the option of formatting the drive as an ntfs.
Hope this helps.
Hope this helps.