I downloaded Mint 17.1 on a P4 1.6GHz PC with 1.25 Gb RAM. Installation was easy, on a  single hard drive (fully formatted NTFS), no self-set partitions. A message device won't mount or similar came up on the desktop and I can't use the hard drive. I'm new to all this. I don't undrstand programming.
Hard disk Won't Mount
linux mint