You can contact support per the first link or try the tools and information in the links below:
How to reach support (FAQ) - http://forums.microsoft.com/WindowsOneCare/ShowPost.aspx?PostID=2421771&SiteID=2
Firewall repair tool - http://forums.microsoft.com/WindowsOneCare/ShowPost.aspx?PostID=2468376&SiteID=2
OneCare won't start - http://forums.microsoft.com/WindowsOneCare/ShowPost.aspx?PostID=2523777&SiteID=2
Virus and Spyware repair tool - http://forums.microsoft.com/WindowsOneCare/ShowPost.aspx?PostID=2667445&SiteID=2
-steve