To my knowledge support for writing to NTFS partitions is typically not enabled in the kernel. Also, I'm not sure if all kernel sources have that functionality. I'm assuming you are trying to remove the file from the NTFS partition because you say you are trying to delete malware from a "NTFS hard drive." With that said you might have to enable NTFS write support (possibly have to patch a kernel). I believe at this stage it's still experimental. I would advise that you do some research on it.Hope this helps!