My computer keeps logging me off. Windows Vista?

Hear me out here: Turn your screen saver back on, and then hit apply. It should show a new checkbox that says "On resume, show logon screen." Uncheck it and click apply. Then turn off the screen saver again. Also go back into power options and click on "Advanced Options" and find the option "change require password on wakeup" to no. This should do the trick. If not, try doing Windows Updates, it may be a glitch that can get fixed with a few updates. :)