Update problem for Office XP Service Pack 1

[Judy]

I had just tried to download and update to the Office XP
Service Pack and came across a problem with the cd
option. I currently have Office XP Small Business
installed, and recently had bought and installed
Frontpage. However, once the download for the service
pack was complete and it was preparing to update all
files, it also requests for the Office XP Professional
with Frontpage CD. I've tried putting in Office XP CD as
well as Frontpage CD, but it still won't finish update.
It's asking for a ProPlus.msl file that I don't have. Any
solutions for this would be greatly appreciated.