My computer has ground down to a startlingly glacial pace. It seriously moves so slowly that I'm frustrated beyond words. The only upshot is that I know the reason for my PC's turtle impression and that it will be temporary.
This is the first company I've worked for that pushes software updates to computers in the middle of the day. Everywhere else I've worked updates computers overnight or immediately upon booting up. At my current company, however, you get into a groove, PowerPointing this or Exceling that, then BAM! It takes 30 seconds for the computer to respond to a mouse-click.
It is beyond irritating and every time it happens, I do the same thing - go get lunch.