please how to fix grub after re-installing windows 7?

[André L]

address@hidden:~$ sudo fdisk -l

Disco /dev/sda: 320.1 GB, 320072933376 bytes

255 heads, 63 sectors/track, 38913 cylinders, total de 625142448 setores

Unidades = setores de 1 * 512 = 512 bytes

Sector size (logical/physical): 512 bytes / 512 bytes

I/O size (minimum/optimal): 512 bytes / 512 bytes

Identificador do disco: 0x80000000

Dispositivo Boot Início Fim Blocos Id Sistema

/dev/sda1              63      257039      128488+  de  Utilitário Dell

/dev/sda2          257040     4466069     2104515    c  W95 FAT32 (LBA)

/dev/sda3   *     4466070   540519260   268026595+   7  HPFS/NTFS/exFAT

/dev/sda4       540520446   625137344    42308449+   5  Estendida

/dev/sda5       619161228   625137344     2988058+  82  Linux swap / Solaris

/dev/sda6       615843840   619159551     1657856   82  Linux swap / Solaris

/dev/sda7       609636352   615835647     3099648   82  Linux swap / Solaris

/dev/sda8       540520448   603424767    31452160   83  Linux

/dev/sda9       603426816   609634303     3103744   82  Linux swap / Solaris

Partições lógicas fora da ordem do disco

address@hidden:~$ sudo mount /dev/sda8 /mnt

address@hidden:~$ sudo grub-install --root-directory=/mnt//dev/sda

install_device not specified.

Usage: grub-install [OPTION] install_device

Install GRUB on your drive.

  -h, --help              print this message and exit

  -v, --version           print the version information and exit

  --modules=MODULES       pre-load specified modules MODULES

  --boot-directory=DIR    install GRUB images under the directory DIR/grub

                          instead of the /boot/grub directory

  --grub-setup=FILE       use FILE as grub-setup

  --grub-mkimage=FILE     use FILE as grub-mkimage

  --grub-mkrelpath=FILE   use FILE as grub-mkrelpath

  --grub-mkdevicemap=FILE use FILE as grub-mkdevicemap

  --grub-probe=FILE       use FILE as grub-probe

  --no-floppy             do not probe any floppy drive

  --allow-floppy          Make the drive also bootable as floppy 

                          (default for fdX devices). May break on some BIOSes.

  --recheck               probe a device map even if it already exists

  --force                 install even if problems are detected

  --disk-module=MODULE    disk module to use

INSTALL_DEVICE can be a GRUB device name or a system device filename.

grub-install copies GRUB images into /boot/grub, and uses grub-setup

to install grub into the boot sector.

Report bugs to <address@hidden>.

address@hidden:~$