It is possible that your problem is a bad entry for Office in the Windows
Installer configuration. If so, the cleanup utility at:
http://support.microsoft.com/default.aspx?scid=kb;en-us;290301
will help you fix the problem.
Windows XP has several options for repair {such as SFC /scannow} which do
not require a reinstallation of Windows XP. Suggest you seek help on
repairing Windows XP from:
microsoft.public.windowsxp.general
or
microsoft.public.windowsxp.help_and_support
Sorry, did not understand from your OP that you were using Windows XP.
Also, most find using Microsoft newsgroups easier by using a newsreader such
as Outlook Express. In Outlook Express, Tools, Accounts, News tab add a
account for: msnews.microsoft.com
Don