You need to add a paper size with the paper dimensions flip flopped to your Printers and Faxes server properties...
EX.
Control Panel -> Printers and Faxes...
File->Server Properties...
Select the paper size you want to print to from the list (let's use Arch D {24x36}
Click "Create a new form" and give it a name, I used "Arch D (Landscape)"
Flip flop the sizes (i.e. Arch D default is Width=24, Height=36)
Arch D Landscape would be (width=36, height=24)
Click "OK" and use that as your paper in AutoCAD...