I really like Ubuntu, but my family is used to Windows and I would like to dual boot it but accidentally did a full install and now I just have Ubuntu.
Is there any way to me to get back Windows Vista 64 bit?
Unfortunately you'll need to reinstall - when you do I suggest you follow this guide so you can keep the Ubuntu installation and dual boot the operating systems together.
If you used the whole hard disk for Ubuntu, NTFS partition you had for windows got reformatted as a Linux partition. Then you cannot get back Windows Vista using usual methods.
I am not sure if any data recovery tool works or not.
To confirm if you still have windows vista partitions remaining, Open a terminal (Application -> accessories) and issue the command
If you see NTFS as a value for any line entry in last coloumn, that is your windows partition. But if you are only seeing Linux there, you are out of luck.