[wudzzy]

сегодня опять это произошло на моих глазах.

ошибка вот такая

A disk read error occurred press ctrl+alt+del to restart

по теме , нашел вот что

Ok, it is confirmed. Windows trashes itself if you have a boot partition larger than 137GB. Because Windows writes something at the end of the boot partition, since using 48bit mode Windows can't access anything past 137GB and will write the data at the 137GB or somewhere else on the drive depending on where the location gets truncated into 48bits. Now Windows works fine as long as you have written no data at that point but when you do, that's when all the fun starts and you mysteriously cannot boot no matter what you try. Now if you were to remove some data then shrink your partition down to under 137GB then you computer will mysteriously start working or will work after you use the Fixboot or Fixmbr procedures or replace the MBR and/or repair the partition.

но не мой случай , винт всего 80гиг.