I am using windows xp. For some unknown reason when logging onto secure sights such as banks/credit card companies a windows pop up warning appears stating that the website certificate is not valid. I can continue, however I am unable to carry out any transactions as the pop up appears again stating an error has ocurred.
What is it in my settings I need to change...............my lap top works fine with no problem at all.
It might also be worth chhecking the date on your PC. Ages ago I kept getting similar messages about certificates (though they said the certificate was out of date) which was fixed when I realised that I had the date set to sometime in 1970.