I've just rebooted my Laptop and the Norton Power Eraser (NPE.exe) jumped into action. After several minutes of scanning, it produced this report:
Some familiar names there. Any suggestions what I should do? My instinct is that they are all false reports and that I should simply uncheck all of them. I've never experienced this before, i.e. neither NPE jumping to life on its own nor the recommendation to ditch such well-known files such as the Steam directory!!!
Of course it's possible I've got a virus infecting lots of folders and I'll check for that next.