The other day I found out my brother was going through my files, and I was so pissed that I tried to just block him out of all my files, and I did this by going to the Users folder and right clicking my folder and changing the security, removing everyone from the list except for me. I changed ownership to me, and I was just so mad that I didn't even know what I was clicking. I did this for a few sub folders as well. But after this, some programs weren't working, and I keep getting errors from programs. All I really want to do now is undo what I did, but not knowing what I did, I'm finding this hard. I've tried changing ownership back to System, and adding people to the allowed list, but nothing is working. I'm still getting program errors and the like. Does anyone have any ideas?