I use a browser from an American search engine and advertising company, together with a operating system from an American company...I would be surprised if my extensions were the only thing spying on me!
What's been left out on the computer issue is actually pulling the plug. I just had a server today that had locked up PSUs and no amount of waiting with the power off would help. Once I actually pulled the plugs, the system came up normally. Additionally we have some older desktop switches that will fail and will not work again until the transformer is pulled from the wall/power strip and NOT the jack in the box itself. Just some things to remember.