Installing Office 2003 for multiple users on one PC

I need to install Office 2003 on each PC in my
department. Because we're a shift-oriented department,
more than one person may log into any one of these PCs.
So, obviously, each copy of Office 2003 has to be
available for whoever logs in.

Why is it that, whenever a user first opens Office, it
goes through the ridiculous installation routine, as if
the product weren't even loaded? I do full installs of
everything I need, so I don't see why it's interrogating
the source server/directory every time.

Also, whenever Excel is executed, the following message
appears:

Compile error in hidden module: AutoExecNew.

I've found that this is the result of a file,
pdfmaker.xla, that resides in the user's profile. All my
research on the web seems to suggest just deleting the
file, but, it will come up again whenever another user
logs in and opens Excel.

Appreciate any help on these issues.
Thanks.