I really need help. I have a macbook 15 in. screen..runs Mac OS X, 10.7.2..obviously I have no idea what I'm talking about but..when I try to do the Software Update for Pro EFI Firmware update , it says the Update Cannot be Saved and "cannot be verified" and may have been corrupted during download and will run on the next scheduled download..well it's been this way for a few weeks and doesn't seem to run an Update on it's own. Aswell, around the same time this started happening, every so often when I go to a website like yahoo or google something pops down saying the certificate for the site might not be valid, and asks if I should continue or not..and I do and it's okay..but just something else I noticed..please help,lol.