My computer has been blocked?

My girl friend went onto google chrome and said a bunch of ad's kept popping up about a virus on our computer and it not being safe so she uninstalled it. Today I went onto Safari and it said something similar on the home screen which I thought was odd. I then re-downloaded chrome and immediately different pop ups starting appearing and no matter how many times I click ok or x out it won't let me, and I can't get out of chrome either. These are what the messages say.

"The page at directtwv.com says: Your computer has been blocked!! Norton detected virus attack on your computer. For security reason, Contact Norton support to unblock your PC [Removed] Toll Free"

The computer is not even a week old, at this point its basically only been used for emails, what is going on?