After trying to recover ubuntu partition even winXp partition doesn't boot

[dbeg]

Hi

I installed ubuntu on second partition (on first is WinXp). After succesfull installation and rebooting the system there i couldn't choose beetwen WinXP and Ubuntu, system was automaticly booted from first partition.

i tried to recover ubuntu partition using this guide (i've booted ubuntu from flash drive):
https://help.ubuntu.com/community/RecoveringUbuntuAfterInstallingWindows#Quick

but i wasn't able to get trough step 4 where I got the same error:

"Error 15: File not found" if I tried to write
find /boot/grub/stage1
or
find /grub/stage1

After that I quit trying to resolve the problem, but when I rebooted computer, even WinXP didn't boot from first partition!!

I'm sorry if this is a trivial problem, but I'm a beginner in Ubuntu.

[ufuxlinux]

I understand that your Ubuntu partition is on /dev/sda2. Boot into livecd, open up a terminal:


sudo mkdir /mnt/ubuntu
sudo mount /dev/sda2 /mnt/ubuntu
sudo grub-install --root-directory=/mnt/ubuntu /dev/sda

(if your disk device's name is hda, replace sda's with hda)

[dbeg]

I get response

ubuntu@ubuntu:~$ mkdir /mnt/ubuntu
mkdir: cannot create directory `/mnt/ubuntu': File exists
ubuntu@ubuntu:~$ sudo mount /dev/sda2 /mnt/ubuntu
mount: you must specify the filesystem type
ubuntu@ubuntu:~$

?

[dbeg]

These are partitions of my HD:


ubuntu@ubuntu:~$ sudo fdisk -l

Disk /dev/sda: 500.1 GB, 500107862016 bytes
255 heads, 63 sectors/track, 60801 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x24ff24ff

Device Boot Start End Blocks Id System
/dev/sda1 1 6374 51199123+ 7 HPFS/NTFS
/dev/sda2 6375 60800 437176845 f W95 Ext'd (LBA)
/dev/sda5 6375 12748 51199123+ 7 HPFS/NTFS
/dev/sda6 19123 60800 334778503+ 7 HPFS/NTFS
/dev/sda7 12749 18219 43945776 83 Linux
/dev/sda8 18220 19122 7253316 82 Linux swap / Solaris

Partition table entries are not in disk order

Disk /dev/sdb: 1031 MB, 1031798784 bytes
255 heads, 63 sectors/track, 125 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x91f72d24

Device Boot Start End Blocks Id System
/dev/sdb1 * 1 126 1007584+ 6 FAT16
Partition 1 has different physical/logical endings:
phys=(124, 254, 63) logical=(125, 112, 51)

I partitioned my 500GB disk when I installed Win XP into 3 partitions of 50GB and one with the rest of space. After that, I partitioned the second partition of 50GB with ubuntu partitioner into ext3 and swap. Can be this a problem, because now I have all patritions except first one (sda1) listed under extended sda2.