Permissions Issue

I have a My Book World.  It works great but I have 8-9 files that I can’t access all of a sudden.  I get the message:

The folder “ Folder Name ” can’t be opened because you don’t have permission to see its contents.

I am the only user of my mac and the hard drive.  I can’t seem to change the permissions at all.  I’ve done the get info, and to change access but no luck.  Any Help would be greatly appreciated.

Try this link

Resolving File Permission Issues