1.My computer used to come up on my desktop when I turned it on. Now it has started coming up on the sign in screen. I don't need this because I am the only user on my laptop. How could this have changed on its own and how would I go about fixing it. 2.Also, my computer is running slower today. I have defragged, done disk cleanup, run a virus scan, clean out my cache in Firefox, but still running slower. Also have rebooted, which help a little bit. What else can I do? 3.How can I know which programs are starting up on startup and which ones I can tell not to. How would I do this? Thank you for any help you can provide.