OSX cant open some .dmg and .avi files, other open fine

Hi,
Ive encountered a problem with opening files on my new iMac.
The problem is some .DMG files and .AVI files are not able to be opened, which have previously been fine. Where as some where fine, and still are. The problem files have white icons and are grey'ed out. They cannot be renamed, deleted and moved. These files have previously been fine, I downloaded them, installed or watched them, then stored them on my portable hard drive. They have just suddenly became un-usable.
Its weird how 90% of the AVI and DMG files I have open fine, but some have just suddenly became un-usable. If I go to delete the files, it states they are being used by another application. If I go to change the default opening program from VLC to Quick Time it states I don't have the correct privileges.
Whats going on here?

Yeah I've done that many times. Doesn't seem to make a difference. Don't know what to do now. The problem files seem to be files that I have transferred to the portable hdd since I've had my iMac.
The drive is formatted in NTFS but I followed a tutorial on how to get read and write access. Could it be that osx can't write the files to the drive correctly? I'm not sure. It's weird because the files work perfect for a day or two after copying, but then become un-usable.

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