Supporting other people's computers can be a trick business. Those being supported like to know what is going on... even if they don't understand. They like to have a reason for the problem.
There are times when you need to have reason for a problem at hand but you simply don't have clue. This is where the issue generator can come in handy. With a little bit of ad-hoc embellishment, you can have the most persistent customer convinced.
And always remember: with excuses like these, you're sure to have a new employer by the day's end.
(Use with caution!)