Hi Amy,
I do not know what is going on in your specific case, but my solution would
start with updating your print driver from the printer manufacturers
website.  Make sure the a printer is installed locally, not just a networked
printer.  I would also recommend updating your graphics driver, Office,
DirectX and Windows.
If the problem persists after all these updates, post back and give us a bit
more information (PowerPoint version, printer, etc.)
--
Bill Dilworth
A proud member of the Microsoft PPT MVP Team
Users helping fellow users.
http://billdilworth.mvps.org
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