Reset NTFS permissions (Can't access External HDD)/(No Security Tab)

Need Help!

I don't know what I was thinking! I changed the permissions in my External Hard Drive for "all users" to "Deny All". Now I can't access my Hard Drive (I have an administrator account) neither with the "Administrator" system account. Booting in safe mode didn't work and connecting the External HDD to another computer with a different workgroup/domain didn't work too. For all these, the Security Tab is missing in the properties for the External Hard Drive and Windows reports as it have 0 data (But I know it has gigabytes of data).

Is there a method for reseting the NTFS permissions or to get access to the security tab?

Windows 7 64x

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