Powertools Wallpaper Changer
A user with elevated privileges has installed Powertools Wallpaper changer. Then the testteacher account logged on to the machine and somehow picked up the same thing. Then the testteacher account logged on to a laptop afterwards, and then I logged on to the same laptop.
Now my wallpapers are changing every 30 minutes too! Anyone know where these files are located so I can get rid of them? There's nothing to uninstall (as I haven't installed anything for this, I just got it by logging onto the same machine as another user that has it configured).