PDF Print via VB

[SDELISLE]

I'm using this code to Select the correct Pagesize and print via VB 6.0

' Select my printer pageSize
Printer.PaperSize = 3
Printer.Orientation = 1

' Print
nForm = frmMDI.ActiveForm.Tag
nMaxPage = pdDoc.GetNumPages()
r = AcroExchAVDoc(nForm).PrintPages(0, nMaxPage, 1, 0, 0)

* This Works correctly on Developpement Computer. The correct pagesize printout but if I install it on a End-Customer computer. It's print but with the incorrect pagesize.

I'm already check the Drivers version, Windows Version, Sp. Using the same print Server.

Any Body have an Idea ?