update windows 7 to 10

I just did this upgrade. Right now the biggest problem I am having (and currently searching for an answer to) is that CTRL+ALT+DEL does not work...which means I can't log into Windows without using an external keyboard.

is it needed?

haven't installed it on a mac yet but updated a surface 2 pro to win10 today and there I see the login image and sliding upwards or using arrow key up (I assume) leads me to the screen where I can type in the user passwords and choose between the users

For me, yes. It's an part of a setting our our domain policy at the office. Plus if you need to access task manager quickly or whatnot while in windows

im reinstalling boot camp drivers that I just downloaded to see what it does

Downloading new boot camp drivers in os x, then reinstalling those drivers in windows 10 fixed it. might be worth your time to do that after you upgrade just to head off an potential issues