Hi, I just finished putting together a new PC. I got the system builder pack Vista x64 with it, along with a free copy of Win 7 RC and an upgrade coupon. What I'm trying to figure out is: if I just install Win 7 RC right now, will I be able to just activate it with the product key when my coupon copy of Win 7 comes without reinstalling it, or will I have to get rid of Win 7 RC, and install Vista just to upgrade it to Win 7 again?