This message has started to come up when I access most webistes - including the ones I know are fine - like my bank. I have to select that I want to continue (whilst being warned that it is not recommended. Why is this happening and how can i stop it?
If your PC use is critical to you, then it's worth looking at now. If not then wait and see if it happens again. It may just have been a random error caused by another process or, heaven forbid, you may have accidentally changed the date / time yourself and not realised.