New Computer

I've just got my new computer up and running. Pictures as soon as I have it in its final working place (macMinis are so awesome). Quick question, though. When we backed up the old computer, my brother set the data to "No Access". This is supremely annoying, because I have to manually change every folder to Read/Write in order to transfer the data. Is there any way in OS X (or *NIX) to reset it all to R&W?