Re: before downloading upgrade advisor
You'll want to use the Adviser for the OS you want to upgrade to. (e.g. If going to 8, then use 8).
HOWEVER, I would NOT upgrade from 7 to 8. I don't know how MS screwed that one up but they did. Do a clean install of 8 to avoid some major bugs.
Humans are the only creatures that won't live up to the their potential. Give everything your all. When you die, die on E.
So I ask you, what do you intend to do now?