Error in installing updates...

Hi Guys
I have two update files that are not installing, they are:
- Update fo microsoft XML core services 4.0 service pack 2
- security update fo MS XML core services 4.0 service pack 2

I have setup for automatic updates, the issue is the though the files have
been downloaded, (several time) when i shut off, and the pc install the
updates when i next power on the pc windows downloads the files again, it
appears as the the files are not insalling properly. I have even tried
downlaoding manually...

please help

travo_420