That's what happened to me, too. I did not intend to upgrade till later on. But it loaded beyond my control. I felt hoodwinked. I messed with Win 10, and went back to Win 7.
That's what hacked me off the most. Win 10 actually works and so far I have no problems with it. I just didn't like their -mugged in the alley- way of installing it. In fact as soon as I had installed it and checked it out I went out and bought a big flash drive. My intention was to start working off of LINUX just because MS is not the company I wish to keep. So far though, Win 10 is behaving so well I haven't done anything with LINUX yet.