virus signature database

Hi all
my virus database last updated on dec 30th, ever since then the computer downloads around 30% of the program and then chucks it out saying I do not have an Internet connection, (oh yes I have )
I have tried a manual and auto update and neither will work. I have scanned the computer and get the all clear, I have used the comodo system cleaner and it shows all clear, I am now tempted to uninstall and then reinstall the program.
any other ideas please?

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