Update unsuccessful for Office XP Pro

[emperorcanada]

Can someone please assist me?

I've tried several times to update my bought copy of
Office XP Pro without successs. (Microsoft Word has been
crashing incessently for weeks). From the Microsoft
Office website I download the service pack which then
begins to install. It checks the CD in my drive but then
stops installation and gives the error 'update
unsuccessful' without explanation.

Any ideas on what I might be doing wrong?

Thanks!

Richard
Edmonton, Canada