We have seen several cases where people have restored files from one Windows PC to another Windows PC (both of which use NTFS file systems) and then they can not access the restored files or folders on the new PC, even if they are logged in on an administrator account. The problem is small but important difference between the administrator accounts on the two PCs.
This IBM Support page, How to take ownership of a file or a folder in Windows XP, explains how to fix this. While the page is specific for Windows XP, it also applies to Vista.
June 29, 2015