Start a free Windows Update support incident request:
https://support.microsoft.com/oas/default.aspx?gprid=6527
For home users, no-charge support is available by calling 1-866-PCSAFETY in
the United States and in Canada or by contacting your local Microsoft
subsidiary. There is no-charge for support calls that are associated with
security updates. When you call, clearly state that your problem is related
to a Security Update and cite the update's KB number (e.g., KB974455).
LOOK!! => If your problem relates to a Cumulative Security Update for IE,
call the above number and ask to be transferred to the "Consumer IE queue"
(which is 47830).
For more information about how to contact your local Microsoft subsidiary
for security update support issues, visit the International Support Web
site:
http://support.microsoft.com/common/international.aspx
For enterprise customers, support for security updates is available through
your usual support contacts.
PS: Why isn't SP3 installed yet? Computers running WinXP SP2 will NOT be
offered any further critical security updates, Automatic Updates will cease
to function, and Windows Update website will not be available after 12 April
2010 until and unless SP3 is installed.