Soldato
I've recently set up a Windows 7 PC and when browsing the web half of the websites I visit, Opera throws up a privacy error "Your connection is not private" with error code Net::ERR_CERT_AUTHORITY_INVALID. This has happened in the past when the clock on the PC has been wrong because the BIOS battery failed or something, but the clock is right this time. It's a fresh install of Windows 7 so I haven't had time to break anything