powertron

I have been having problems updating 'Office 2003 and Word Viewer 2003'. I am being prompted to install them by installation shield in my system tray. When I try to install them I get this message 'The following updates were not installed....Security Update for Word Viewer 2003 (KB917346) Security Update for Office 2003 (KB921566)'. I have also downloaded these updates seperately and tried to install them manually, but I get this message 'The updates cannot be applied'. I have just tried reinstalling 'Net Framework 1.1' package, but still I can't install the updates, yet I am constantly being prompted to install them. Any suggestions as to the installation would be greatly appreciated.