Hello Jim, this error is most likely not caused by One Care. I suggest the Microsoft Update Solution Center -
http://support.microsoft.com/default.aspx/ph/6527#tab3 Use the link "Contacts" on the left side of the page then use the link that says "
Windows Update fails while scanning for, downloading, or installing updates" to contact a support professional.
Jim - MVP Windows Live / Windows Live One Care Forum Moderator