Delete system files off old Windows Vista hard drive

I have a harddrive from an old laptop that I now use for external storage/backup connected via USB cable to a SATA Mobile HDD.
I am trying to clear out the folders that are no longer useful such as C:\Program Files and C:\Windws, but security settings are preventing me from doing it.

Using Windows 7, how do I gain permissions to delete these folders?
I tried using "takeown" (like suggested here: but since my Windows 7 login is not an admin on the old Vista drive, it did not work.

Please advise.
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krzyinsaneConnect With a Mentor Commented:
Why not just format the drive using disk manager?
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