Can't seem to change the permissions on an external hard drive

HEELLLLPPP! We have a Western Digital terabyte hard drive that we initially set up on our Mac. We backed up both my husband's and my iTunes libraries to this hard drive from our individual work PCs, and reconnected to the Mac to do some duplicate file clean up. . . only the durn Drive seems to have it's permissions now locked as read only. Is there a way to re-set the Western Digital permissions on the Mac so that we can truly clean up and delete all duplicate files? We both just spent a combined effort of about 25 hours in iTunes deleting (we THOUGHT) almost 25 gig of duplicates, but when they didn't delete from the hard drive. . .
Repair of this drive in Disk Utility is not available (all options grayed out), we have re-hooked it up to our windows PCs and reset file attributes, security, etc. and given "Full Control" to all users, and it still shows up as Read Only on the Mac.
Anybody have any ideas?

Select the drive in the Finder and choose Get Info from the File menu; if it is listed as being in the Windows NT Filesystem, install a software package such as this one onto the Mac.
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