I think that first thing to do is to visit Windows Update and make sure that all critical and important updates have been downloaded and applied.
Also, verify that the date and time on your computer are correct as this can cause the error on start that you are encountering.
If all updates are installed, and the date and time are correct, but the problem persists, please contact support -
How to reach support (FAQ) - http://forums.microsoft.com/WindowsOneCare/ShowPost.aspx?PostID=2421771&SiteID=2
-steve