Updates for Office 2003...no install disks and error pop ups...

I inherited a desktop PC with Office 2003..the licenses seem to be fine as
far as I can tell. I do not have the original install disks. When the
updates try to launch, I get various error pop ups and none of the updates
install. Here is what the pop up says:

*****************
Microsoft Professional Edition 2003
The feature you are trying to use is on a Network Resourse that is
inavailable.

Click OK to try again or enter an alternative path to a folder containg the
install package "Pro11.msi" in the box below.
*
******************

Am I out of luck without the install disks in hand?...CF