I have only two versions of Windows 10 installed on my machine, I see six on bootup?!

I honestly think that you should go for 8 as 8 installs is much better than 6.

Other than that I'd probably backup all your important files, download an iso, of windows 10, extract the contents to a usb stick and boot from that stick. There's an option to eventually erase all the partitions and clean install. it's not ultra super easy but there's a LOT of walk through tutorials on the web.
 
I honestly think that you should go for 8 as 8 installs is much better than 6.

Other than that I'd probably backup all your important files, download an iso, of windows 10, extract the contents to a usb stick and boot from that stick. There's an option to eventually erase all the partitions and clean install. it's not ultra super easy but there's a LOT of walk through tutorials on the web.
The thing is only two out of these six actually work
 

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