KB934180 and KB934445 update failures

I had the same problem as others have mentioned with a failure to install
these two updates. Then I remembered having the same sort of problem with a
February update. The following MS Knowledge Base article fixed my problem:
Article ID 884298, "You cannot install an Office 2003 service pack." I do use
a registry cleaner but fortunately it creates a backup of the old registry
and I could find the product code GUID value I needed (it happens to be the
same download_code subkey given in the article).