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#11
I wouldn't expect to see a 450 mb partition as part of a Win 7 install. Maybe that's part of an aborted Win 10 upgrade? I don't know.
Nor do I know why you are not allowed to delete any partition you see when you come to the "where do you want to install Windows screen".
If you want to do a clean install of Windows 7 and have backed up or don't care about anything else on the hard drive, you can certainly go to Diskpart by hitting shift F10 right after booting from your install disc when you come to the language screen. Diskpart has a "clean" command that will wipe out any partitions on the disk.
If that's what you want to do.