Verify if date and time of the computer is correct.
If the date and time of the computer is correct.
Use this tool. CaclsDeleteDB
http://www.microsoft.com/downloads/details.aspx?FamilyID=4bc2594b-95ab-4235-b5b8-41656b38480f&DisplayLang=en
Also this one. AntiMalware repair tool
http://www.microsoft.com/downloads/details.aspx?FamilyID=70adca25-950c-4b1b-a5e2-297e80aa67b1&DisplayLang=en
If both fails.
How to reach support (FAQ) -
http://forums.microsoft.com/WindowsOneCare/ShowPost.aspx?PostID=2421771&SiteID=2