It had solved , the error encounters from thousands of a bad sectors :( i do not know how it happened but recovery system has repaired after then mount /dev/sda /mnt ext3 grub-install /dev/sda
has worked thanks
<snip> "Thousands of bad sectors"? Today, order/walk in and buy a replacement disk. NOW!
Your other option is to have no computer, because if it's in the thousands of bad sectors, you probably had a head crash, and the drive *will* be dead in days, if not today.
mark