Groovorio virus

I have Norton Internet Security, supposedly all updated and everything. I recently got the Groovorio virus. Whenever I go to Google Chrome, it redirects to groovorio and my computer goes nuts telling me to call for technical assistance, blah blah blah

Two questions:

1. If I pay for Norton, how did I get this virus?

2. How do I get rid of it and make sure it doesn't come back