So, I've been using my 1.8/ssd for a couple months now, and really love it, have had no real issues, until now. I went to instal stuffit expander, and it told me I didn't have admin privileges. I went to instal something else ( forgot what it was) and had the same thing. I'm the only user, and of course have full admin access. then, I decide something might be weird, and go to run software update, and it doesn't work. Comes up, starting the little bar going across, and always stops at about 1/5 the way through. Any ideas what's going on?