My system is a bit messed up. When I try to log into Yahoo mail it says "problem with website security certif.

I get this a lot. The matter is with your virus protection program; sometimes mine will not allow me to use sites I use almost daily. Sometimes the certificates are not updated properly, thus giving you the message.

If everything else checks out, disregard it.

you should never login when you see something like that. best thing to do is close the browser and open it new and type in www.yahoo.com and sign in there cuz you know its right and then go to mail. but its too late now. gl