Access violation Attempt to Read/Write Protected Memory Vista

vb .net application that is trying to access the default printer to get
printer settings. In Vista I get an invalid operation exception. I thought at
first because there was no local printer defined only shared printers so I
created a dummy local default printer but get the same error. The code works
for Windows XP.

In stack trace the last code entered was

system.drawing.safenativemethods.documentproperties