Re: hard driver not shown
Whether or bot GRUB is in the MBR of the hard drive only matters if you're booting from the hard drive -- which you should NOT do if you want to install Windows. That error message you're seeing indicates that you're still booting from the hard drive, not from a CD or DVD.
First thing you need to do is go into the BIOS and ensure that you're booting from the CD/DVD drive. Don't know which key to press on your PC, as they're all different, but generally, pressing the Del key or the F1 key gets you into the BIOS settings.
Second, you don't want any partitions on the drive if you're going to install Windows -- the installer will create the partition for you and format it in the process. IF you can't get the drive empty using GParted, then, using another Windows PC, download and burn a CD of the Minitool Partition Wizard Boot CD -- and use that to remove the partitions from the drive.
After that, you should be able to boot from a Windows disk and do the installation. Personally, I would recommend Win7, if you have that option.
Ubuntu 14.04, Mint 17; MS Win 8.1.
Will not respond to PM requests for support -- use the forums.