Re: More computer trouble
have you looked at you partitions ?
look at the middle row which is the "c" drive, the one the computer starts off with. Yours may be in a different position depending on how many HHD/SDD drives you have in your computer
You will see it is split into 3 sections ,the middle section is the one that the computer recognises to get your computer working. The last section is the backup part.
Now although adding windows 10 overwrites the middle section it then gets into conflict with the last back up section.
This I think is what your problem is, that last section (showing 477MB on my computer) needs to also be deleted. However i might be wrong, it is a long time since i upgraded and of course I am no computer expert so best to double check first with one.
But that is the area I think you need to look at, ie the partitions