After running TestDisk
After writing a new partition structure, you have to reboot for the change to take effect. Check the filesystems and repair them if necessary.
Ext2fs/ext3fs
To undelete files on linux, you can try 
e2undel
ReiserFS
If the superblock of a reiserfs partition is missing, it can be rebuild with reiserfsck --rebuild-sb device.
NTFS
To check a NTFS partition from Windows, run chkdsk c:
Linux/FreeBSD
You may have to update your /etc/fstab to reflect the new partition order.
Dos - Win9x
If your OS doesn't boot, you can reinstall the system files with "sys c:".
Windows 2000/XP/2003
If your Windows doesn't boot, try fixmbr from the recovery console and fixboot to repair NTFS boot sector.
Multiboot
You may have to update your multiboot configuration and reinstall the multiboot in the Master Boot Record.
- Lilo: /etc/lilo.conf, lilo to re-install
- Grub: /boot/grub/grub.conf, grub-install device
- Windows (NT/2000/XP/2003/...): c:\boot.ini, run fixmbr from the Recovery Console (ie. fixmbr \Device\HardDisk0)
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