[SOLVED] gparted and ubuntu installation does not detect my hard correctly

Hi all,
recently I've downloaded ubuntu 12.10 and I'm not able to install it because of I think
a hard disk failure, ubuntu installation and G-Parted dont recognise my drives correctly and they just show my hdd as a raw one, (unallocated).
I just have one hard (sda) and winxp is installed on that,
disk utility on the ubuntu live recognises my hdd correctly,

This is what sudo sfdisk -l command shows me:

Warning: extended partition does not start at a cylinder boundary.
DOS and Linux will interpret the contents differently.

Disk /dev/sda: 60801 cylinders, 255 heads, 63 sectors/track
Units = cylinders of 8225280 bytes, blocks of 1024 bytes, counting from 0

Device Boot Start End #cyls #blocks Id System
/dev/sda1 * 0+ 6373 6374- 51199123+ 7 HPFS/NTFS/exFAT
/dev/sda2 6374+ 60801- 54428- 437186342+ f W95 Ext'd (LBA)
/dev/sda3 0 - 0 0 0 Empty
/dev/sda4 0 - 0 0 0 Empty
/dev/sda5 6374+ 19121 12748- 102398278+ 7 HPFS/NTFS/exFAT
/dev/sda6 19122+ 31221 12100- 97193218+ 7 HPFS/NTFS/exFAT
/dev/sda7 31222+ 43434 12213- 98100891 7 HPFS/NTFS/exFAT
/dev/sda8 43435+ 60800 17366- 139492363+ 7 HPFS/NTFS/exFAT

AND:

G-parted shows a warning too, (can't have a partition outside the disk!)
it takes a long time for g-parted to scan my devices when it starts, and at last it just shows an unallocated part with that warning (can't have a partition outside the disk!).

thanks for any help