Having trouble switching to Minecraft for windows 10?

When installing windows 10, no files are affected. The only thing you would need to do is log back in when launching minecraft.

Yes, but when I click on the link It wants me to login, I can login fine but since I got a new computer it wants me to answer security questions which I forgot. Then I clicked on the link to reset the questions but it was sent to old email.
(Sorry I just realized I just should of added this to begin with)