Now, this might overwrite the Master boot record as well, and make it so you can't boot Linux, but the Mint install CD might have a repair for the MBR as well (Ubuntu does anyways). From the recovery console run ' CHKDSK : /F'. Here is a link with pretty pictures on how to get to the recovery console. To get there, boot to your Windows XP cd and the press 'R' and then 'C'. I would probably use recovery console from the windows XP disc as my first choice. If its actually the partitions that are broken: You might also try Testdisk from Linux or try these instructions for a more manual approach. Then I would use the Ubuntu boot cd to try to restore the Grub boot loader which, I would guess, fix the dual boot system with Rajat's instructions.

I would use the fixmbr from the Windows Recovery console (See Option 1 from next section) and see if that fixes it. Since Ubuntu can't see the partitions, sounds like it might actually be the partition table that is messed up, not the partition table itself. Basically I am saying, back everything up first:-) You could also use ntfsclone, see this serverfault question and answer. You will of course want to copy these images to a safe place. To backup the MBR with dd: dd if=/dev/sda of=~/mbr.img bs=512 count=1

For example to back up your ntfs partition if it is partition three on the device sda: dd if=/dev/sda3 of=~/windows.img I would use partimage or dd to create an image of all the partitions.

Hiren boot partition magic