For the last few months my cpu has been giving me the most annoying of problems. Somehow when we had a power outage where I live the time on my computer changed. Now the time changing doesn't sound like much but for some reason my security certificate has now become invalid making it impossible to get on sites like Facebook, Twitter and even parts of my University's Blackboard. I would change it but I don't have administrative authorization on my cpu (the ******* who gave it to me left himself administrator and I've lost contact with him); what can I do to fix this problem?