Feng Yun Luo,
Refer to this post for information and resolution for install error code 0023-80070643.
http://forums.microsoft.com/WindowsOneCare/ShowPost.aspx?PostID=3793097&SiteID=2
If it wont resolve the problem contact support.
How to reach support (FAQ) -
http://forums.microsoft.com/WindowsOneCare/ShowPost.aspx?PostID=2421771&SiteID=2