You didn't mention which operating system the new computer is but you should be able to follow the instructions in the links below"
How to take ownership of a file or folder in Windows XP
How to Take Ownership and Grant Permissions in Windows Vista
Hope this helps.
My dell inspiron mother board crashed and I got a new toshiba satellite. I can acces my old hard drive through a USB hookup except for the files that were "not shared". Is there a way to access these files through my new computer?