Office 2003 Upgrade Install Error

[Dan]

I just purchased Office 2003 Standard Upgrade. I have
Works Suite 2000 (which the box and Microsoft's site both
say is eligable for upgrade). When I go to install it
asks me for an Office CD to upgrade from. I put in the
Works Suite 2000 CD1 but the install won't continue. I
don't have Works installed (as I just reformatted my
drive) and I don't want to reinstall it just for the
upgrade. Any ideas?

Thanks

Dan