If you have automatic updates turned on I would turn off automatic updates temporarily.
Go to the following link and install the windows update agent. If you are running 32 bit windows you need to install the windowsupdateagent30-x86.exe file.http://support.microsoft.com/kb/949104
If you are updating by going to the Windows update web page http://update.microsoft.com/
then you may already have this version installed automatically. If this does not solve the problem, go to the Windows update web page and on the lower right corner click the button that offers the updater for both Windows and Office updates. Install this automatic updater. If the offer is not visible then you already have this updater installed.
If the problem is not solved, what error code are you getting?