These can appear at various times
Error messages are the computers way of saying "I've got a problem", this is the clue to the problem. They can appear when you first turn on
your computer, or immediately after the 'desktop/wallpaper' has appeared, or when you go to perform a particular task.
Some error messages can be safely ignored, but most should be looked at as soon as possible.
Don't let these error messages stop you from spoiling your enjoyment.
Is your computer / laptop slow ?...