Dear Microsoft. When I select "install in the unpartitioned space on drive 'D'" I don't think it at all unreasonable for me to expect you to you to do that, and it's something of a shock to discover that you thought I selected "There's a Fat32 partition on drive 'C' so stick some of the boot files there instead, and when drive 'C' is removed the computer will just sit there until I get tired of trying repair options and reinstall" instead.
Thanks ever so much, love and kisses, Peter.
