The Connection Is Untrusted?

[Scarlett]

For some reason I cannot seem to get onto Google or any other site as I just get an error message saying the connection is untrusted and something about a certificate. I have run the adware remover but I can't even open AVG without it saying it can't connect to the internet. I have been able to open Answerbank though. Any idea what i can do? I also can't open Google etc on AOL either so it's not a Firefox issue. I am on Windows XP but shortly to get a new computer. Thanks

[Old_Geezer]

Check your PC's date/time.
Warnings can be ignored if you trust the site.

[Scarlett]

Thanks Geezer- weirdly, my PC was set to an hour ahead and 16th March 2016. Very odd. I put it back and the warnings have stopped. Why would it suddenly change though?!

[Old_Geezer]

Just an hour is difficult to say. Were it way out it could be the PC's internal battery, but an hour ? Maybe the PC "thinks" that it's summer time.