printing problems in Windows 2000 pro

Help. This is probably a very silly question to many people, but I’m having a nightmare.
I have set up a form on my windows nt4 sp6.0 print server.
i have tried to print from a windows 2000 based test machine to our standard mannesmann tally mt151-24 printer. It doesn’t matter what I do, the form always prints portrait on a landscape form. What do I need to do to stop this happening???