I think I'm a bit lost. Are you trying to Activate? What happens when you click on the Activate link? I don't understand "continuous loop" in your description - can you provide more details? Where are you being taken and what happens?
You can't renew the trial - it is good for 90 days only. Once the trial expires, you must uninstall it or purchase a subscription via activation - using a retail key or a credit card. Note also that OneCare is not available in all markets. If you are being directed to http://get.live.com you should see this post - http://forums.microsoft.com/WindowsOneCare/ShowPost.aspx?PostID=1202298&SiteID=2