Look under Tools/Options
See
and
http://help.ptc.com/creo_hc/creo30_pma_hc/usascii/index.html#page/pma/fundamentals/fund_five_sub/Using_the_Options_Dialog_Box.html for a more in-depth description.
Your best bet for editting is Notepad. The line to add is:
graphics win32_gdi
with a space character between "graphics" and "win32gdi"
