Question : Windows XP SP2 Install Problem

I cannot install SP2.  In the event log the message is
Event ID: 4373
Windows XP Service Pack 2 installed failed.
An internal error occurred.

Answer : Windows XP SP2 Install Problem

probably a bad registy entry here are the steps to fix it http://support.microsoft.com/default.aspx?scid=kb;[LN];873148