If you have problems regarding Windows Update check the Windows Update Solution Center
Windows Update Solution Center - http://support.microsoft.com/ph/6527
If want to re-install onecare
Use this onecare cleanup tool for uninstallation.
Onecare cleanup tool. Save the file first before executing.
http://go.microsoft.com/fwlink/?LinkID=81699
Then re-install onecare from
http://onecare.live.com