GRUB loading. error:uknown filesystem

[joke_joker]

Hello

This is my first post so I will try to explain the problem as well as possible.

I bought a Windows 7 netbook and created two new partitions. A 2 gig swap partition and 30 gigs free space,

I then downloaded Ubuntu 10 netbook edition and installed it to the 30 gig free space. At this point everything worked, when I booted my netbook I was welcomed to a GRUB selection screen and was able to go into both Windows 7 and Ubuntu.

Here is where the problem started. I used the Windows 7 partitioning software and set the 30 gig Ubuntu partition back to free space. I then downloaded Mandriva One and used Win2Flash to create a bootable Mandruva USB. Using the USB i installed Mandriva One on the 30 gig partition.

Now when I boot I get the message: "GRUB loading. error:uknown filesystem", and a command line pointer: "recovery>".

I can not boot into either Windows 7 or Mandriva, but still have the bootable Mandriva USB.

Running the command fdisk -l gives this output:

Disk /dev/sda: 160.0 GB, 160041885696 bytes
255 heads, 63 sectors/track, 19457 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x6fe5ac79

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1               1        1698    13639153+  27  Unknown
/dev/sda2   *        1699        1711      104422+   7  HPFS/NTFS
/dev/sda3            1712       14876   105743712+   7  HPFS/NTFS
/dev/sda4           14877       19457    36796882+   5  Extended
/dev/sda5           14877       15248     2988058+  82  Linux swap / Solaris
/dev/sda6           15249       19457    33808761   83  Linux

Disk /dev/sdb: 4009 MB, 4009754624 bytes
64 heads, 32 sectors/track, 3824 cylinders
Units = cylinders of 2048 * 512 = 1048576 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x3b0150e3

   Device Boot      Start         End      Blocks   Id  System
/dev/sdb1             691         691        1024    c  W95 FAT32 (LBA)
/dev/sdb2   *           1         690      706559+  17  Hidden HPFS/NTFS

Partition table entries are not in disk order

To the best of my knowledge:
/dev/sda1 = system partition, came with Windows 7.
/dev/sda2 = recovery part for win 7.
/dev/sda3 = win 7 installation
/dev/sda4 = not sure about this one
/dev/sda5 = swap
/dev/sda6 = Mandriva installationi

Help please?

[joke_joker]

FIXED: Reinstalled Ubuntu.