Upgrade missing DLL refernece

I use MS Excel to produce reports, which are printed to PDF and then e-mailed

I have the reports run on one machine but do my report building on another.

When I have built the report I, on the other machine have to remove the reference to the PDF dll and create a new one even though I have the same version of PDF creator installed and have used the standard install setup.

The files are opened from a network drive but PDF creator is installed locally on each machine.

Is there a problem or am I doing something wrong?