(I am not using the UEFI feature)
Apparently,none of the solutions in any other posts and forums worked for me For some reasons I decided to remove ubuntu from my hard disk drive after which I had problems so I reverted back to the below.
My partition table(presently):
(/dev/sda1) (fat32) 900 MiB ---(MBR,I suppose) (/dev/sda2) (ntfs) 70 GiB -----(Windows 7) (/dev/sda3) (ntfs) 314.88 GiB --(Personal File storage) (/dev/sda4) (ext4) 80 GiB -----(Ubuntu 13.04) (unallocated) ----- 1.31 MiB
I do not want to format the win7 partition for a fresh one. I have used boot-repair..Restore MBR option brings back to "Disk error...." without even going through grub..so I reinstalled grub and I'm able to boot into Ubuntu. grub menu shows the win7 option as "Windows 7 (loader) (on /dev/sda1)" but goes to the same "Disk error..." message.The methods used by other people,(such as,bootrec commands...etc.) again caused this message to be shown before the grub menu.