work loss

Hi there, When attempting to shut down my computer, I've had the error message 'If you shut down now, you will lose the work that you and others are doing on your computer' where as far as I'm aware, there is only me working on the computer. Is this something i should be worried about? or is...

This happens every time I delete a field, not just on a specific document, but on every document that I create. If I accidentally create a field can not delete it because I fear that I will lose all of my work in the process... It really is getting annoying. This is the error that comes up or...