Need help : Unable to gain access to a hard disk.

Hello. I am using Windows vista home basic 32bit Os. I clicked th
security tab in the properties dialog box of a hard drive and denie
access to it for all users. Later when i opened the same, i could no
find the security tab in the properties. But the properties of othe
hard disks have the security tab. Even being as an admin, i cannot fin
the security tab
Can anybody suggest me how to allow access to this hard disk

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kamma