Hello,
It can be downloaded for free.
Download Ubuntu | Ubuntu
That is the one i have used. It works just fine. It will recognize the NTFS and the FAT32 no problem. You might have to mount the drives but that is easy to do.
Use Ubuntu Live CD to Backup Files from Your Dead Windows Computer :: the How-To Geek
Check that thread there. It is exactly what you are looking to do.
Cheers,
Mak