All Appstore and  Mac updates Fail saying "...could not be verified or may have become corrupt"

Recently my Mac started to become glitchy so I decided to wipe the hard drive and reinstall my OSX Mountain Lion. After doing so almost all of my updates fail showing this msg "...could not be verified or may have become corrupt". Not to mention downloading updates take ridiculously long. I have 80mbps down and small updates say they could take up to 2 days. I wanted to try upgrading to the the newest OS however that also has the error msg…not to mention a 4 days estimated download!
any help with this would be greatly appreciated!
and yes I did set my date and time to automatic.

Mavericks Download can’t be verified

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    My TechNet Wiki Articles

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