You don't happen to be a student, I guess? You can get pretty good prices on MS Office if you are.
Anyway, otherwise -- is this going to be something that comes up a lot? If so, I'd go ahead and buy a good PDF printer for Windows. It shouldn't run you more than $30-$40. There are also free ones I think, which you can try first if you desire.
Here's a free one:
http://www.bullzip.com/products/pdf/info.php
Here's another free one (I think):
http://sourceforge.net/projects/pdfcreator/
Google PDF printer and you'll find more if needed.
Anyway, once you get one installed, it will show up just like a printer from any program, and if you print to it, instead of printing, it will create a PDF of your document in the location you specify. So "print" from openoffice to that, put the PDF on your stick, and take it down to the printer.