Ubuntu Linux

Hi… recently I upgrade my windows vista to windows 7, but I lost the grub, now my computer only start with windows.

I found in the forum many options to restore the grub but doesn’t work. I don’t know if I’m doing something wrong. for example, I follow the steps in http://ubuntuforums.org/showthread.p…l+grub+windows

this is the information of my disk

Disco /dev/sda: 320.0 GB, 320072933376 bytes
255 cabezas, 63 sectores/pista, 38913 cilindros
Unidades = cilindros de 16065 * 512 = 8225280 bytes
Identificador de disco: 0x517182bf

Disposit. Inicio Comienzo Fin Bloques Id Sistema
/dev/sda1 * 1 10444 83886080 7 HPFS/NTFS
/dev/sda2 10444 38914 228681728 7 HPFS/NTFS

Disco /dev/sdb: 60.0 GB, 60022480896 bytes
255 cabezas, 63 sectores/pista, 7297 cilindros
Unidades = cilindros de 16065 * 512 = 8225280 bytes
Identificador de disco: 0×02830282

Disposit. Inicio Comienzo Fin Bloques Id Sistema
/dev/sdb1 1 7298 58612736 7 HPFS/NTFS

Disco /dev/sdc: 80.0 GB, 80026361856 bytes
255 cabezas, 63 sectores/pista, 9729 cilindros
Unidades = cilindros de 16065 * 512 = 8225280 bytes
Identificador de disco: 0x4b4b4b4b

Disposit. Inicio Comienzo Fin Bloques Id Sistema
/dev/sdc1 * 1 9327 74919096 83 Linux
/dev/sdc2 9328 9729 3229065 5 Extendida
/dev/sdc5 9328 9729 3229033+ 82 Linux swap / Solaris

I have
1 SATA disk (320Gb) with 2 partiotion (one windows 7 system and other for programs)
1 IDE Disk with 60gb for documents
1 IDE Disk with 81Gb for Linux..

Could somebody help me to reinstall grub? Thanks