Originally Posted by BrianS
Awsome. OK, boot into safe mode and log into an account with admin powers. Turn on the external drive so windows can see it. Once it has synced up, open up "My computer" and right click the external drive and click properties. You should see a "Security" tab, click that. Then you should see a button that says "advanced", Click it.
On the new window that pops up, click the "Owner" tab. You should be able to highlight a group similar to "Administrators" and click apply. You may need to hit another "Edit button" to highlight a group to take ownership with.
After you have taken ownership, you should be able to view the files anytime.