Thank you for your reply, and suggestions.
I really don't know what I changed. I have a lot of different software on the machine, not only Ubuntu.
I also have two hard drives, the second which was installed at a later date from the original setup of Ubuntu.
I think I will need to speak to the technician who built the machine, with me, and see what she can tell me, as I am very new at Ubuntu, and don't understand a lot about it YET!
I have KDE software on the machine as well as Wine, also third party software.
Maybe it is referring to these programs,